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pitts_pilot(at)bellsouth.
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 Posted: Sat Aug 28, 2010 7:19 pm Post subject: lessons learned installing plexiglas with Weld-on 10 |
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AirMike wrote:
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This has been discussed many times before on this forum, just my $.02 - I am not sure that there is any way to properly retain the windows in place without a high probability of getting cracks if you use weld-on. The stuff sucks, but nobody has come up with a substitute that will perform the same function of making the windows structurally bond.
Why does there need to be a structural bond? Any small physical change
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will result in the breaking of the acrylic. Also there are many
'structural adhesives' that don't harden, but you'd still have trouble
getting a 1/2" glue joint to fail.
Linn
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MauleDriver(at)nc.rr.com
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| Posted: Sun Aug 29, 2010 7:37 am Post subject: lessons learned installing plexiglas with Weld-on 10 |
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For those on the fence concerning Weld-on - I bought some a little
over a year ago and used it about 5 months ago. No cracking so far (not
flying).
Qualitatively it seems to be a helluva adhesive for plexi in that it
really bonds with it while simultaneously bonding with fiberglass. Way
beyond epoxy. Seems almost better than the plexi to plexi bond you get
with MEK. But no data or facts here, just casual testing.
I used the aluminum finger method and no straps. Didn't try to force
anything together. Just trued up the fiberglass surface as best as I
could, left a good healthy gap around the edge, glopped it on, cleaned
it up while curing with a 50:50 acetone paint thinner mix, removed
most/all of the fingers within an hour or so. Glassed over the edges
with very thin cloth. Still sanding.
It was a tough decision to make in the face of all the warnings but
didn't want to waste the already purchased product. The Vans solution
may not be ideal but I was confident I could make it work with some
care. Geoff seems to have one of the best thought out alternatives but
my experience suggests the Weld-on can work just fine with some care
exercised.
The only warning I have is get your stuff all laid out, walk thru your
routine, and don't break for coffee until done. The stuff does setup
quickly, the stringy stuff is hard to clean up if you start messing up
and let the mess cure. I used my life partner to help with the first
window but was able to do the rest of it single handed.
Oh, and the stuff has a strong smell. I used an organic filter type
mask which blocked the odor but don't know if it blocked any toxicity.
I sealed up the mixing jar, rags and scrap ASAP and got them out of the
shop. If I had my fresh air system then, I would have used it.
Just a data point.
Bill Watson
On 8/29/2010 10:41 AM, AirMike wrote:
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The word that I heard (do not know - rumor or fact) was that Vans tested a prototype cabin/plane with normally installed windows and when dropped on its top, the windows popped out and the the cabin deformed. The word is that they then did it with weld-on adhered windows and the windows stayed in place and the cabin did not deform.
Truth or rumor that is what swayed my decision to use weld-on. Does anyone know the facts?
--------
OSH '10 or Bust
Q/B - finally done
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=310478#310478
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