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The sandblasting seemed like a yummy idea at first, I had a small plywood cabinet and compressor and blast gun, but created more problems with plate warping, so wont be doing that again

this shows the reason why I went the sandblast route.the blast was done with a 80 grit garnet and the sand with 100grit carbide. The plate was then washed with caustic soda dried with a heat gun and then the pic taken. The greater light reflected back from the sanded side led me to believe that there was more flat surfaces than the blasted side, and therefore bad for bubble formation. this was half the truth, the other half was that blasting increased the surface area too, unfortunately with unwanted concequences....the warping didnt show up on this small sample many many points for bubbles to form, which was the other good reason for me choosing this method. Incidently this was taken with my cellphone (sony ericson K750i) and 20-70X pocket scope, the scope sits on 3 little screw in legs. this is to show the amount of curvature on a 200mm X 125mm plate, definately not what I wanted, anyhow I forged ahead figuring I could fix it at the end....not likely. No amount of blasting on the other side will straighten the plate. I even tried a teeeny weeny little soft blast on a new plate hoping for no warping, but no luck, so I wont be doing the sandblast route again.

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