wood, oops. well i cleaned my hull and notice a few areas were resin pooled had delamed so more cleaning and grinding . mostly were resin pooled . i have white areas. i did the glass work when it was over 90 out. live and learn. also the fuel tank had a piece of 1/4 ply under it glassed in. i put the tank in and i barely have room, height is not there. so my wood working buddy must have miss calculated the stringers by 3/8 or so. do i need to have ply under tank or just screws into the stringers. i guess ill have to add to top of stringers if nessesary