sarg314(at)comcast.net
Guest
|
 Posted: Sun Jul 13, 2008 1:05 pm Post subject: UV SmoothPrime progress |
 |
|
On June 8, 2008 I made a rather long post describing how I used UV
Smoothprime. I've altered my technique for the better lately and I
thought, for the record, I'd add what I have learned since.
I follow the steps outlined in the earlier post with the exception that
I now
1- wait 1/2 hr between successive coats of UV smoothprime (instead of
15min) and
2- sand each coat lightly at the end of the 1/2hr, blow of the dust with
compressed air and then start the next coat.
The sanding is VERY modest. Sanding my whole lower cowl - the largest
piece on the plane - with 400 grit open coat paper is only 5 or 10
minutes of work. You aren't trying to really smooth it out. You're just
trying to break open any tiny bubbles that have formed. These tend to
happen more at the edges, but can happen anywhere. Don't over sand the
edges - it's easy to go all the way thru at the edge!
After all 6 or 7 light coats are applied, the piece is pretty smooth to
start with and sands rapidly to a completely smooth surface. Polyfiber
says don't sand all the way thru it. It is used to rebuild the surface,
not spot fill pinholes (although it does that too). Use the glancing
illumination technique with a pen light described in the earlier email.
I think this is crucial in spotting pinholes and imperfections and
especially in telling you when to stop sanding a spot. If you're not
real near-sighted, put on a pair of strong drug store reading glasses so
you can become near-sighted. Or use a big magnifier. It's a definite
plus in examining the surface visually.
I don't claim to be a fiberglass expert or even a proponent of UV smooth
Prime. There are probably better ways to finish fiberglass. I'm just
reporting that I finally figured out a way to use the stuff that seems
to work well. Beware that my process contradicts Polyfiber's
documentation and advice!! I couldn't get the stuff to work using their
advice. I was probably doing it wrong - putting it on too thick, I'd
guess. But this procedure seems to have a high probability of working,
for me anyway.
--
Tom S., RV-6A
| | - The Matronics RV-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?RV-List |
|
|
|
Get Email Distribution Too!
FAQ
Search
Memberlist
Usergroups
Register
Profile
Log in to check your private messages
Log in
