re: Homemade Fish Box?

if glassed correctly over 2" rigid insulation, you do not need the plywood. i have about 6 homemade boxes in various sizes, all of them are at least 15 years old and get heavy use

all the plywood is going to do is add weight (these boxes are already heavy) and wood that can eventually rot if your glass barrier gets cracked

fiberglas is very forgiving. just a couple of tips

1) make SURE your surface is clean, no dust, no dirt. vacuum it well and wipe it with a tack rag

2) make sure all your edges and joints are rounded

3) pre-cut your mat, with generous overlap

4) dont mix your hardener too hot unrtil you get a feel for the process, you do not want it to kick before you are ready

5) go heavy on the epoxy until you get a feel for it. make sure your mat is wet/wet/wet with no white showing and no air bubbles

6) go slow, it will take a while for you to get the mat wet enough to lay down at the corners and whatnot

7) after your first layer kicks, get your grinder out with a flap disc, and sand the shite out of it...no shiny spots remaining. then vacuum, tack rag, and go again