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Message: <blockquote data-quote="Stand Up" data-source="post: 506937" data-attributes="member: 31842">I have used post foam many times.  It will never explode in the bag unless total neglect is shown during the mixing process, but even then, highly doubtful.  However, I think it would be advisable to mix a batch up and experiment with it first.  Put a piece of foam in a tub or a barrel of water and see what happens.  Does it take on water?  How heavy is it?  What degree of adhesion does it have?  Will it react to the aluminum and cause the erosion of the aluminum?  How much buoyancy does it have, or how much foam will be required in your boat to keep it afloat?I can tell you it will last a long time in the ground and it holds posts well.  It does not allow water to pool around a post causing rot. It's good stuff for what it is intended for.</blockquote>