You have probably had this conversation many times but... here goes. I am building my own kit teardrop and I will need to seal the plywood underside of the base layer (subfloor). I have considered a 2 stage epoxy, spar varnish and truck bed-liner paint. I am leaning towards bed-liner because it is tough, ever so slightly flexible (less chance of cracking?) and thick. I am thinking of sealing the top side (interior) with spar varnish (tung oil based) for the VOC issue. What do you folks say?
Thanks