Fiberglassing coumpound surface

[Bitsyncmaster]

Here is a trick I learned when building airplanes. Use Saran wrap to lay over your wet fiberglass patch. Then you can work the air bubbles out and if you keep checking it as it dries, keep the glass in compound curves. Another option is to bury it in sand or lead shot. The Saran wrap just peals off no effort when the epoxy is dry. I use T-88 epoxy.

[David T]

If you want to get really fancy you can also tape the edges and hook up a vacuum to it. What kind of airplanes do you build?
David Teitelbaum

[john 05141]

To really get the bubbles out, you should indeed vacuum it. I agree if you would do this work above your head as bubbles can not escape downwards. But in general the bubbels will rise and escape buy itself. It will also be a more smooth surface than when you remove the plastic afterwards. Epoxy is easy to sand anyway.

Jan

[Bitsyncmaster]

Experimental GP4 airplane. Not a kit, just built from plans. But construction tricks were learned at EAA meetings.

Yes vacuum bagging is the best way to do it.