Foam campingv mattress as alt closed cell foam
 

My McMaster order got lost in the post and i was wondering if i can use parts of a camping bed-roll type foam mattress as closed cell foam? I stuck it under the tap(faucet) and it seems to withstand the "squeeze" test. Can anybody give me the yes or no on this as i'm being held up with my water/pelt setup? :rolleyes:

I was in the same boat,what to use to fill the spaces.I now am useing dieletric silicone compound for ignition systems from napa auto parts, and fiberglass insultion.I coated the back of my mobo then covered it with fiberglass the same stuff in your atic, then i did the same with the space under the cpu then wraped my water block.the silicne and fiber glass is easy to clean off your mobo and hell i'm running @ 33F with no problems. "easy to find parts"! :)