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Message: <blockquote data-quote="nlb34" data-source="post: 500886" data-attributes="member: 33489">I used Owens Corning Foamular polystyrene 2" thick foam board insulation, the pink stuff.  It cuts very easy with a sharp razor blade, I marked and cut each side which was deep enough to snap each piece apart.  Any shaping was done with the razor blade as well.  A saw would have just made a big mess.  No glue needed for my boat as each seat holds 5 sheet perfectly tight.  Note I did leave about a 3" gap off the bottom which will keep the insulation from sitting in water and also allow water to run under each bench seat.While I am sure other insulation would work I read that polystyrene should hold up over time both to water/ice and also wont break down and leave little white beads all over the boat.</blockquote>