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EuropaXSA276(at)aol.com Guest
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Posted: Sun Nov 19, 2006 2:16 pm Post subject: To Those That Have Sanded Before Me... :) |
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To Those That Have Sanded Before Me...
Would anyone like to share a helpful hint on applying filler smoothly to a leading edge? The Anti Servo Tab is giving me fits today....
Thanks in advance.
Brian Skelly
Europa XS TriGear #A276
North Texas USA
You can see my build photos at:
http://www.europaowners.org/BrianS
[quote][b]
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josok-e(at)ukolo.fi Guest
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Posted: Sun Nov 19, 2006 3:21 pm Post subject: To Those That Have Sanded Before Me... :) |
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Hi Brian,
Don't think there is a simple trick for this.
Basically, apply the filler generously, and sand back later. Honestly, it was difficult, and i was happy to get professional help.
Kind regards
Jos Okhuijsen
Visit - www.EuropaOwners.org
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jeff(at)rmmm.net Guest
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Posted: Sun Nov 19, 2006 6:50 pm Post subject: To Those That Have Sanded Before Me... :) |
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Hi Brian,
I just put it on thick, sometimes using my fingers... gloved of course.
Let your large sanding block with 80 grit in diagonal motion one way,
then back the other take it back down to the shape of the leading edge.
Get with anyone local thats built a glass plane. I did with a local
long EZ builder and his advice or on hands experience was priceless.
Regards,
Jeff
A258 Gold Rush (at) 55 hours
On Nov 19, 2006, at 4:14 PM, EuropaXSA276(at)aol.com wrote:
Quote: | To Those That Have Sanded Before Me...
Would anyone like to share a helpful hint on applying filler smoothly
to a leading edge? The Anti Servo Tab is giving me fits today....
Thanks in advance.
Brian Skelly
Europa XS TriGear #A276
North Texas USA
You can see my build photos at:
http://www.europaowners.org/BrianS
|
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grahamsingleton(at)btinte Guest
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Posted: Mon Nov 20, 2006 3:14 am Post subject: To Those That Have Sanded Before Me... :) |
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Jeff
agree it's best to get all the filler on at the first pass but then sand
to a template of the L Edge, it needs to be accurate to a couple of thou
or you may well have a nasty stall. It's very easy to knock off the
sharp LE radius even with unbacked abrasive paper. The position of the
center of the radius is critical too. Believe me, the stall can be quite
benign but it can also be vicious.
You need the CAD coordinates of the section and Turbocad or similar.
Autocad does it of course but that can be Xpensive.
I don't have the CAD any more but someone has. Kingsley old mate?
Graham
JEFF ROBERTS wrote:
Quote: | Hi Brian,
I just put it on thick, sometimes using my fingers... gloved of
course. Let your large sanding block with 80 grit in diagonal motion
one way, then back the other take it back down to the shape of the
leading edge. Get with anyone local thats built a glass plane. I did
with a local long EZ builder and his advice or on hands experience was
priceless.
Regards,
Jeff
A258 Gold Rush (at) 55 hours
On Nov 19, 2006, at 4:14 PM, EuropaXSA276(at)aol.com wrote:
To Those That Have Sanded Before Me...
Would anyone like to share a helpful hint on applying filler
smoothly to a leading edge? The Anti Servo Tab is giving me fits
today....
Thanks in advance.
Brian Skelly
Europa XS TriGear #A276
North Texas USA
You can see my build photos at:
http://www.europaowners.org/BrianS
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wmjack1(at)t3cs.net Guest
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Posted: Mon Nov 20, 2006 5:54 am Post subject: To Those That Have Sanded Before Me... :) |
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Composite racing sailboat builders use a technique that produces a fair surface, without bumps or valleys, while minimizing weight or extra filler. They screed the filler/resin mix onto the surface using a small-toothed, serrated plastic trowel (the same kind used to apply ceramic tile cement to walls). After it cures they use a ‘long board’ to sand it down. The ‘long board’ is not a fixed size. It can be 2” x 24” , 4” x 48” or any other size, depending on the surface area to be sanded. Most of them are made up in the shop using a piece of planking with a couple of hand made handles screwed to it and the sand paper glued or clamped to that. The long board rasps off the high areas, but leaves the valleys clearly identified by the serrated ‘stripes’ of resin/filler. On the next pass you only need apply the mix to areas that remain ‘striped’. It saves work because the actual surface area to be sanded is reduced to the high points or ‘lands’ left by the serrated trowel rather than a raised patch left by a smooth trowel. It also saves on expensive resin. You get an additional bonus using the technique in that the serrations also leave a greater surface area, and irregular surface, for the next coat to bind with or key to. Hope this helps. I spent plenty of time working on racing sailboats in the US and UK so I know the technique works with resins from both sides of ‘the pond’. Hope this helps.
Regards,
Jack Hilditch
From: owner-europa-list-server(at)matronics.com [mailto:owner-europa-list-server(at)matronics.com] On Behalf Of JEFF ROBERTS
Sent: Sunday, November 19, 2006 9:49 PM
To: europa-list(at)matronics.com
Subject: Re: To Those That Have Sanded Before Me...
Hi Brian,
I just put it on thick, sometimes using my fingers... gloved of course. Let your large sanding block with 80 grit in diagonal motion one way, then back the other take it back down to the shape of the leading edge. Get with anyone local thats built a glass plane. I did with a local long EZ builder and his advice or on hands experience was priceless.
Regards,
Jeff
A258 Gold Rush (at) 55 hours
On Nov 19, 2006, at 4:14 PM, EuropaXSA276(at)aol.com wrote:
<?fontfamily><?param Arial><?x-tad-bigger>To Those That Have Sanded Before Me...
<?/x-tad-bigger><?/fontfamily><?fontfamily><?param Arial><?x-tad-bigger>
<?/x-tad-bigger><?/fontfamily><?fontfamily><?param Arial><?x-tad-bigger>Would anyone like to share a helpful hint on applying filler smoothly to a leading edge? The Anti Servo Tab is giving me fits today....
<?/x-tad-bigger><?/fontfamily><?fontfamily><?param Arial><?x-tad-bigger>
<?/x-tad-bigger><?/fontfamily><?fontfamily><?param Arial><?x-tad-bigger>Thanks in advance.
<?/x-tad-bigger><?/fontfamily><?fontfamily><?param Arial><?x-tad-bigger>
<?/x-tad-bigger><?/fontfamily><?fontfamily><?param Arial><?smaller>Brian Skelly
<?/smaller><?/fontfamily><?fontfamily><?param Arial><?smaller>Europa XS TriGear #A276
<?/smaller><?/fontfamily><?fontfamily><?param Arial><?smaller>North Texas USA
<?/smaller><?/fontfamily><?fontfamily><?param Arial><?smaller>You can see my build photos at:
<?/smaller><?/fontfamily><?fontfamily><?param Arial><?smaller>http://www.europaowners.org/BrianS
<?/smaller><?/fontfamily>
<?fontfamily><?param Courier New><?smaller>
<?color><?param 0000,0000,EEEE>www.aeroelectric.com<?/color>
<?color><?param 0000,0000,EEEE>www.buildersbooks.com<?/color>
<?color><?param 0000,0000,EEEE>www.kitlog.com<?/color>
<?color><?param 0000,0000,EEEE>www.homebuilthelp.com<?/color>
<?color><?param 0000,0000,EEEE>http://www.matronics.com/contribution<?/color>
<?color><?param 0000,0000,EEEE>http://www.matronics.com/Navigator?Europa-List<?/color>
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<?pre><?b><?font size=2 color=000000" face="courier * The Builder's Bookstore <?a * Aeroware Enterprises <?a HomebuiltHELP <?a href="http://www.matronics.com/contribution">http://www.matronics.com/chref="http://www.matronics.com/navigator?europa-list">http://www.matronics.com/Navigator?Europa-List<?/a> ===========
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[quote][b]
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EuropaXSA276(at)aol.com Guest
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Posted: Mon Nov 20, 2006 7:19 am Post subject: To Those That Have Sanded Before Me... :) |
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This is a very interesting technique Jack. I am assuming that a flat trowel is used on the second pass to fill the valleys?
Brian Skelly
Europa XS TriGear #A276
North Texas USA
You can see my build photos at:
http://www.europaowners.org/BrianS
[quote][b]
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grahamsingleton(at)btinte Guest
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Posted: Mon Nov 20, 2006 7:38 am Post subject: To Those That Have Sanded Before Me... :) |
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Jack
This does work but it is vital to be certain that the resin/microballoon
mix is identical otherwise you will get hard and soft stripes, I got
that tea shirt once! It would be good with Superfil.
Graham
Jack Hilditch wrote:
Quote: | Composite racing sailboat builders use a technique that produces a
fair surface, without bumps or valleys, while minimizing weight or
extra filler. They screed the filler/resin mix onto the surface using
a small-toothed, serrated plastic trowel (the same kind used to apply
ceramic tile cement to walls). After it cures they use a ‘long board’
to sand it down. The ‘long board’ is not a fixed size. It can be 2” x
24” , 4” x 48” or any other size, depending on the surface area to be
sanded. Most of them are made up in the shop using a piece of planking
with a couple of hand made handles screwed to it and the sand paper
glued or clamped to that. The long board rasps off the high areas, but
leaves the valleys clearly identified by the serrated ‘stripes’ of
resin/filler. On the next pass you only need apply the mix to areas
that remain ‘striped’. It saves work because the actual surface area
to be sanded is reduced to the high points or ‘lands’ left by the
serrated trowel rather than a raised patch left by a smooth trowel. It
also saves on expensive resin. You get an additional bonus using the
technique in that the serrations also leave a greater surface area,
and irregular surface, for the next coat to bind with or key to. Hope
this helps. I spent plenty of time working on racing sailboats in the
US and UK so I know the technique works with resins from both sides of
‘the pond’. Hope this helps.
Regards,
Jack Hilditch
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fklein(at)orcasonline.com Guest
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Posted: Mon Nov 20, 2006 12:19 pm Post subject: To Those That Have Sanded Before Me... :) |
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Jack,
As I visualize this technique, I take it that the strokes of the
serrated screed are chordwise (rather than spanwise) in order to
facilitate the maintaining of the airfoil.
Please confirm.
Fred
A194
Quote: | Jack Hilditch wrote:
> Composite racing sailboat builders use a technique that produces a
> fair surface, without bumps or valleys, while minimizing weight or
> extra filler. They screed the filler/resin mix onto the surface using
> a small-toothed, serrated plastic trowel (the same kind used to apply
> ceramic tile cement to walls).
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wmjack1(at)t3cs.net Guest
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Posted: Tue Nov 21, 2006 4:45 am Post subject: To Those That Have Sanded Before Me... :) |
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Brian,
If the low area is still quite visible (greater than 3” radius is a good rule of thumb to start with), with well defined stripes, I would suggest continuing with the serrated trowel. Typically, a flat trowel is only used for the final skim coat. You might want to try a finer toothed trowel, as the depression is filled with succeeding coats, but the striping (or lack thereof) is really what tells the tale.
Regards,
Jack
From: owner-europa-list-server(at)matronics.com [mailto:owner-europa-list-server(at)matronics.com] On Behalf Of EuropaXSA276(at)aol.com
Sent: Monday, November 20, 2006 10:19 AM
To: europa-list(at)matronics.com
Subject: Re: To Those That Have Sanded Before Me...
This is a very interesting technique Jack. I am assuming that a flat trowel is used on the second pass to fill the valleys?
Brian Skelly
Europa XS TriGear #A276
North Texas USA
You can see my build photos at:
http://www.europaowners.org/BrianS
Quote: | www.aeroelectric.com | 0123456789012345
[quote][b]
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wmjack1(at)t3cs.net Guest
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Posted: Tue Nov 21, 2006 5:01 am Post subject: To Those That Have Sanded Before Me... :) |
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Fred,
The serration direction is immaterial as it will eventually be faired in by
a thin, flat, surfacing coat. This resin/filler application technique is
used to visually identify low areas during initial filling and sanding
steps. As I mentioned, it also provide a better keying surface for
succeeding coats. Using a 'long board', rather than a block sander, for
initial fairing helps to prevent the creation of additional low areas
through spot sanding. It spans existing low spots by resting on higher
surfaces around the depression thereby bringing the low spot into fair.
Regards,
Jack
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wmjack1(at)t3cs.net Guest
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Posted: Tue Nov 21, 2006 5:54 am Post subject: To Those That Have Sanded Before Me... :) |
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Graham,
Agreed. All builders would be well advised to watch the mix consistency
carefully so as to prevent differing moduli of elasticity and (possible)
future problems during any lamination process. However, the step currently
under discussion is non-structural and really only about fairing reasonably
small areas. Filler depth should be quite thin (1/8" or less) so, while
sanding a catalyst-rich filler mix may be a bit more time consuming, it
really shouldn't be too bad. If the areas requiring filler are large or
deep, other considerations may apply.
For all lamination processes it would be prudent to:
1.) Use a standard pump system to manage resin to catalyst ratio.
2.) Mix the two thoroughly before adding fillers.
3.) Measure any additives carefully.
4.) Thoroughly mix the additives into the resin matrix.
5.) Conduct all resin application operations within temperature and humidity
conditions specified by the resin manufacturer.
Assuming those steps are followed, the fairing layers should be nearly
identical in hardness. The only time I ever saw hardness become a factor
was when the mixing process did not adhere to the proper ratio between resin
and catalyst or if the additive was sloppily blended into resin matrix.
Regards,
Jack
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robneils(at)qwest.net Guest
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Posted: Tue Nov 21, 2006 6:18 am Post subject: To Those That Have Sanded Before Me... :) |
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I have near perfect, "suberb" glider wings. Lots of time and a unique tool, a snow picket, made it possible.
Snow pickets are extruded aluminum "T" bars either 2 or 3 feet in length. They are pounded into snow to protect snow and ice climbers so they're light-weight and extremely sturdy because climbers trust their life to them. Snow pickets are also perfectly straight, making them the perfect sanding block. I glued ever finer sanding paper to the bottoms. I used the three-foot T-bar mostly so I'd get not waves. When I got done there were no imperfections. I checked the wings often in the dark using a flashlight or a laser beam to determine the "light-rise" was consistent. As you lift the light source up over an edge, the light-to-shadow line will show all imperfections. The laser lifted over an edge will give the final inspection.
It takes lots of time and patience.
Watch the "spindrift" (let's keep the snow picket comfortable with a compatible vocabulary because you've got to make friends with this tool because you'll be using it a lot) as you work the snow picket. You'll see where the low points are by the absence of "spindrift" as the snow picket slides back and forth going from front to back of the wing sweeping at a 45 degree angle. Move your grip from edge to middle to other edge on the snow fence as you sand. This will allow the power of random numbers "float" the snow picket making the surface superbly smooth. Hours of concentration watching the “spindrift” was the most challenging task I had in the entire build. I took it as a challenge to mental discipline to keep full, alert attention without lapses for hour upon hour. It’s hard to believe but once you get clear into it it becomes very satisfying to see such a suburb finish produced by hand.
I had trouble not seeking perfection on my build. I sometimes put a "moustache on the Mona Lisa" by trying to make the "excellent" into "perfect." Perfection is nearly always demonic. I finally settled on "superb" and operationally defined it as every station on N128HW has to be within 1/2 of a centimeter of where it theoretically belonged or I'd rebuild or modify. But when it came to the wing surface I went all out: The three-foot snow picket and lots of elbow-grease will give you a finish that is beyond what you could even hope for...damn near perfection.
Snow pickets can be bought at
http://store.thebackcountry.net/cart/product.php?productid=18174
for $18 or $20 US for the two or three footer respectively.
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grahamsingleton(at)btinte Guest
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Posted: Tue Nov 21, 2006 9:32 am Post subject: To Those That Have Sanded Before Me... :) |
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Jack
Boat people tend to use polyester materials we use epoxy so it isn't
catalyst it's reagent. Any variation in hardener /resin ratio will be
disastrous, it won't cure properly and unreacted resin or hardener will
prevent adhesion of the next layer, paint or whatever.
Graham
Jack Hilditch wrote:
Quote: |
Graham,
Agreed. A Filler depth should be quite thin (1/8" or less) so, while
sanding a catalyst-rich filler mix
Jack
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NevEyre(at)aol.com Guest
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Posted: Tue Nov 21, 2006 11:15 am Post subject: To Those That Have Sanded Before Me... :) |
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Hi Jack / All,
Filling with a ''comb'' works well on large surfaces like boats [ I was doing that with Polyester resin / Phenolic spheres on 25 '+ boats back in the ' 70's] where the weight is not that critical, but of no real use on our planes.
If the Expancell / Epoxy is mixed runny enough to be combed on, it will be too heavy, and much harder to sand.The Expancell mix should be almost like bread dough to put on.... a real bugger to put on.... and impossible to get on smoothly / thin. As mentioned before on here, fill too proud ONCE, it will sand like dense balsa.... if you have to go back for a second fill you may end up with different densities... which as Graham mentioned, will sand away at different rates. If you managed to comb it on, you will end up with stripes, if you have to fill an area, you will get a ''tide mark''.
Those of you useing Superfil may get it on OK, because that is runnier / heavier / more difficult to sand than correctly mixed Expancell / Epoxy.[ Why oh why do people insist on useing that ?]
Other problems [ with Epoxy] is that all the ''valleys'' that did not get sanded during the profiling, will have to be scuff sanded, to remove the top surface [in preparation for adhesion] before a second fill can be applied,probably have to scrape it all with an Xacto blade, rather negates the point of only sanding the '' hills''?
No short cuts in this world I'm afraid ?
Cheers,
Nev.
[quote][b]
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wmjack1(at)t3cs.net Guest
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Posted: Tue Nov 21, 2006 11:52 am Post subject: To Those That Have Sanded Before Me... :) |
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Grahame,
Years ago, polyester resin was the matrix of choice when wet lay-ups were
the typical building method. However, 'poly' was way too soft. Hulls would
flex considerably, thereby ruining the airfoil shape of the sails as the
rigging sagged. 'Poly' was also prone to wicking salt water into the
laminate structure causing structural delamination and blisters on the hulls
that sometimes reached the size of dinner plates. Those blisters were very
expensive to repair and not a great favorite of anyone charged with keeping
the hulls looking good. 'Poly' also ex-gasifies under the paint causing
bubbles to be trapped lifting the paint membrane. Hulls were/are commonly
treated with an epoxy undercoat before painting, even if the topcoat was/is
Imron or Awlgrip.
Epoxies such as the West System
http://www.westsystem.com/webpages/userinfo/moreinfo/composite.htm
and the SP lines
http://www3.gurit.com/pdfs/adhesive/PSG_Epoxy_Adhesive.pdf
have been more commonly used for building over the past 25 years. They
produce a better and more durable laminate structure. They are used almost
exclusively when constructing a matrix with carbon. In fact, I can't
remember when I last used 'poly' on a boat.
The catalytic component in any resin mix has always been colloquially
referred to as the 'catalyst' or 'hardener' in boat building yards. Mea
culpa, mea culpa, mea maxima culpa. I'm old enough to have gotten into the
habit of using the word 'catalyst' when referring to any hardener. Be that
as it may, the process remains the same.
1.) Mix the resin thoroughly before blending in the filler material.
2.) Once the filler is thoroughly incorporated into the (reacting) resin, it
has a pot life determined by several factors.
3.) Screed the resin/filler mix onto the surface to be faired before the
resin/filler mix hardens in the pot.
As to the mix ratio being critical, I couldn't agree more. That is why I
suggested using a calibrated metering pump system supplied by the resin
manufacturer.
(Our discussion might be over-engineering a simple fairing job. I was just
lurking on the list and thought I'd share a tip that made our lives a bit
easier when sanding in various boatyards over the years.)
Regards,
Jack
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grahamsingleton(at)btinte Guest
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Posted: Tue Nov 21, 2006 2:52 pm Post subject: To Those That Have Sanded Before Me... :) |
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Jack
I quite agree, I just thought I'd share my experience too, I did it on
my Long EZ 20 years ago. (the stripes) unfortunately Superfil wasn't
around then and I still have hard and soft stripes to try and hide,
thankfully only on one wing underside. At least the stripes are chordwise.
Incidentally, spanwise waviness which can be noticed won't hurt laminar
flow but any more than .002 inch per 2 inches cordwise (which won't
show) will. I use a springy flexible spline that follows the curve of
the section and just knocks of the high areas, not a rigid spline. Don't
believe in rigid splines.
Graham
Jack Hilditch wrote:
Quote: | (Our discussion might be over-engineering a simple fairing job. I was just
lurking on the list and thought I'd share a tip that made our lives a bit
easier when sanding in various boatyards over the years.)
Regards,
Jack
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grahamsingleton(at)btinte Guest
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Posted: Tue Nov 21, 2006 3:06 pm Post subject: To Those That Have Sanded Before Me... :) |
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Nev
I have another trick which works for me. I mix in colloidal silica. Try
this, mix up the Expancell then add a little Cabosil..Then you can add
another pile of Expancell to get back to the same consistency. The
Cabosil makes it spread easier. It does NOT affect the sandability.
Then I spread it on over a pair of strimmer lines, remove the strimmer
lines and after 15 minutes careful spread again to flatten the tramlines
and its done. Controled thickness, and thick enough to not need any more
filling. The Cabosil seems to lubricate the Expancell so it spreads easy.
Probably the reason my stripes were hard and soft is that the sanded
surfaces absorbed resin from the next ;layer of filler and went hard.
Superfil doesn't do that for some reason, maybe it has talc in it?
Graham
NevEyre(at)aol.com wrote:
Quote: | Hi Jack / All,
If the Expancell / Epoxy is mixed runny enough to be combed on, it
will be too heavy, and much harder to sand.The Expancell mix should be
almost like bread dough to put on.... a real bugger to put on.... and
impossible to get on smoothly / thin. As mentioned before on here,
fill too proud ONCE, it will sand like dense balsa.... if you have to
go back for a second fill you may end up with different densities...
which as Graham mentioned, will sand away at different rates. If you
managed to comb it on, you will end up with stripes, if you have to
fill an area, you will get a ''tide mark''.
Nev.
*
*
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kenatkinson(at)ktdinterne Guest
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Posted: Fri Nov 24, 2006 3:57 am Post subject: To Those That Have Sanded Before Me... :) |
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Where do I obtain some Cabosil?
Thanks in anticipation.
Ken.
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