You should still wash before and after you sandblast- I did acetone/blast/acetone with about the same setup.
Sanel's in Concord has bags, but you can get pallets of black beauty at the PSNH plant in Bow.
I don't know about "freshness". I think rough and degreased and clean is key. I think you can blast and then wait as long as it is clean. I suppose the polyester oxidizes, but I don't know. Some say a styrene monomer wipe instead of acetone is better, but that's a LOT harder to find.
Personally, I really like vinylester. Really reactive, really tough. Really sticky. But the process is like polyester.
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