okay guy's i want to put some of this expandable foam in my boat before i put in floor, (wife's mind as ease) but i cant find it unless i buy it in a pressure pack form, so what is it called and where do i get it from? all i know is it is a 2 part mix and when asking 16 year old's in a hardware store on the weekend i just get "I don't know can I help you with anything else" and is it safe to put this in under my floor if it already dosn't have it, will it increase the boat's buoyancy and make it float higher in the water