polystyrene beads?

The beer cooler foam is the same as boat dock foam I think, but the dock foam I think is stronger. I have looked and looked in south-south TX, but could find none. I'm up in AR right now and was in Hot Springs trying to find trailer parts and whatnot and a guy at the boat store said I could just have the foam out back. I was skeptical at first and when I got home I cut off the end and the foam less than an inch deep is good, although I'll most likely use foam from deeper in the core.
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The brown stuff on the top cut is just rust from the saw, and that stuff is tough!!!
 
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