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One other thing that's important for good results - install a water trap next to the blast unit to catch condensation that forms in the air hose. Otherwise the moisture causes the glass bead to stick together and it won't come out of the nozzle very well.
Jerry has a good point about contamination, and spilled glass beads on a concrete floor are slippery. I've never used walnut shells but I've read it will disintegrate in motor oil (unlike glass bead) and good for engine parts, such as an intake manifold where bead may get trapped inside passages. Thorough cleaning of parts after glass beading is a must to prevent bearing or cylinder wall damage.
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