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Project Step 2: Sandblast
Make sure that all glue is dry and that all tape is securely burnished to the glass. If your sandblaster allows you to adjust pressure, turn it down to about 25 PSI.
Place the glass in the cabinet and, keeping the blast nozzle several inches away from the glass, remove the exposed iridized surface. For best results, alternate sweeping sideways and up-and-down for even blasting.
Check the glass to make sure no iridization is visible:
If you see bits of irid remaining, mark them with a magic marker to make finding them in the cabinet easier and re-blast.
Important! Do not over-blast the glass. Carving too deeply into the glass will result in air-trapping texture and undesirable bubbles.
One you are done blasting away the exposed iridized surface, peel off the tape and remove the glue with warm water and a scrub brush. Make sure not to use any brush that might scratch the glass.
Here are the two pieces of glass after blasting and cleaning:
Clean the glass well and it is time to fuse them together!