When the OB well lazarette of 338 was being disassembled, we cut out the 1/4" frp covered plywood and found it sopping wet, the foam was sopping wet and when we scraped out the foam which certainly seemed well adhered to the cavities we found puddles of liquid down in the corners. The foam seemed to be a tan colored two=part polyurethane (ie closed cell). The liquid tasted of salt water. While the process of tearing it smelled of funkey plastic - it never smelled of gas. Wonder why???