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Message: <blockquote data-quote="rabbit" data-source="post: 377610" data-attributes="member: 10250">Building foam, pink, blue or white is probably styrofoam. Some building foam and spray in is poly isocyanurate which I don't think is marine rated. Marine foam is urethane. Gasoline will melt styrofoam in a heartbeat. Just a bit of gasoline will melt a whole lot of foam. Don't use it. Use the proper marine rated product. Yea it's too expensive but when you add up all the money you're going to spend on the boat and the cost of possible funerals, it's cheap.   Try how much styrofoam you can melt in an ounce of gas and let us know. It's going to be a lot.   Never skimp on safety.</blockquote>