Building a Sea Chest

[Blue_Heron]

Originally Posted by mbmcdermott18

Can anyone who has made a part with a waxed mold tell me if I will be able to brush the gelcoat onto the mold or will I need to spray it? I have read mixed reports on this.

I've brushed gelcoat and I've sprayed it. I've gotten better results spraying it. If you have a compressor, spray is the way to go. I use a $16 gravity feed gun from Harbor Freight and thin the gelcoat 20% with acetone. Thin the gelcoat before you add the catalyst and use 2% catalyst based on the pre-thinned volume. Make sure you have at least 15 mils thickness of gelcoat.

For mold release, wax is good, PVA (Partall Film #10 if I remember right) is better for this application. PVA must be sprayed. I use the Harbor Freight touch up gun @ 60psi for PVA.
Dave