I dont know the specifics about your
boat but last week I foamed mine and I can say get drop cloths and lots of masking tape its a bit messy. I used fire retardant poly iso foam. Its a closed cell foam, the stuff you get at places like Lowes is an open cell foam that will adsorb
water, avoid that. Make sure its completly dry, dont get it on you and dont breath the fumes.....