Originally Posted by AD 2
.................... However, I've also been told by System that I need to seal the ply with a laminating resin before glassing, otherwise the glass / wood bond would be starved. What did you use as a sealer, and how did it work out?
I did not write my description well. When I said "well sealed and then expoxied" it implies more materials than I actually used. I had cut my plywood boards to form the sides of my box with a close fit. They were fine sanded and then tapped in with a mallet. After this I cleaned the surfaces of the bare wood with acetone and brushed on a layer of epoxy. I repeated the epoxy coatings and then added white pigment to my fainal two coats. This gave me a final expoxy coating inside my box that is about 1/16" and thickened to a 1/4" where it's rounded at the seams in the corners. I did not use any fiberglass cloth and my purpose was only to make a smooth white surface for easy cleaning
,- nothing structural. It has suited me well with no cracks or water
intrusion from inside the box with cycles of frost and defrostings. I don't recall
for sure, but I think I used that "C-flex" epoxy that is marketed to supposedly retain more flexibility in it's final cure. Good luck!