I'm kicking myself for using the spar first. The boat is a 30 year old Cee Bee Avenger 182 Fish and Ski. It was completely rotted out and actually had 3 trees growing from the floor. The stringers were coated well and OK but I just circular sawed out all the floor I could see. As a fair weather fisherman I am hoping to get a good 10 years out of the 3/4 spar plywood. Boat, trailer, trolling motor and all working electronics and pumps only cost me $500 so I should be OK. I am going to rough sand all the edges and score the wood before the fiberglass and carpet. We will see. Thanks for all the help. I will use only fiberglass resin next time.