I want to make a sub box out of fiberglass for my 12" how much fiberglass ( and hwat kind), resin and hardener will I need. Thanks

 

a gallon minimum.. matting depends on what you want to use.. there's several different types of fiberglass mat/cloth, and then you get to hybrid fibers and regular cloth, etc etc..

I would recommend "regular" fiberglass mat, and a gallon of resin for starters.. have your sourse handy, as you'll probably need more- there's just no sense in buying 7 gallons if you're only going to use 2.

 

For some general how-to's and fabric/resin info go to www.fiberlay.com