Posted by Finnegan on 08/26/14 - 3:22 PM
#4
Wing's advice is good, and it is what I also do. I use White Marine Tex, and for a #10 screw, I would drill out 3/8", and be sure to go all the way through the glass and plywood. This will give you a totally waterproof "plug" into which you insert the screw, so water cannot get to the remaining plywood. The rule of thumb is to drill out twice the diameter of the fastener.