Focus Canopy Painting

[Tomanek, Wojtek]

Earl
 
What is PVA?
And how do you layup the fiberglass mold??
 
Thank you
Wojtek 
 
-----Original Message-----
From: EHaury at aol.com [mailto:EHaury at aol.com]
Sent: Thursday, March 20, 2003 4:50 PM
To: discussion at nsrca.org
Subject: Re: Focus Canopy Painting
 
Plastic canopy forming involves heat to soften the material sufficiently to
draw it over a plug for shaping. A black canopy can easily reach the same
temps in the sun. A large canopy may sag when softened, smaller ones may
distort due to mounting stresses.

Anyway, a sure fix is to use the stock canopy as a plug. Simply glue the
flange to a backer board, wax, apply PVA and lay up a fiberglass mold. Use
the mold to fabricate a glass canopy. I use 2 layers of 3/4 oz, 3 layers 3
oz S-glass and a few CF "ribbons" vacuum bagged into the mold. (Bleeder
cloth and absorbent backing in the bag to minimize resin.) West 205
laminating epoxy works well. The glass canopy weighs about one-fourth to
one-third that of the plastic version and is much less heat sensitive. An
easy way to reduce weight and not at all as hard as it may seem to do.

Earl
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