I'm considering changing out the foam in my engine compartment, hood, maybe even going further and attacking the rear of my boat to quiet things down a little. Has anyone used Dynamat? Safe and Sound has a 1/8" thick 36 square foot roll for $220 and I know it won't absorb water and you can double it and/or apply sound foam to it. Some forums in the lower 48 speak highly of it but express caution when it comes to heat. If anyone has worked with this or has done a project with a SJ please post or send me a PM. Thanks.