[mepstein]

I researched a lot of vendors when I went to get my motorcycle parts vapor blasted. I settled on mark propster at nor' eastern vapor blasting in New Hampshire. 100% satisfied. After I had the motorcycle parts done, I started sending him Porsche parts. Two early aluminum engine cases, 3.2 intake and a bunch of other parts. The come out looking so clean, it looks like silver paint. The other nice thing is, as a previous poster said, it closes the pores of the metal so it's much smoother than bead blasting and doesn't absorb dirt or oil so it stays much cleaner. In the motorcycle world, it's said to be safe for engine internals. There is no residue on any of my parts. It doesn't remove metal so tolerances shouldn't change. However, I only had the exterior of the Porsche cases blasted. There's one before and a couple after pics. The before is the dirty one.