I like your spring spreaders. They match well with my spreader tool.Every external body panel was sanded clean. Mostly with a DA. Yes I've used glass beads extensively, but only on "hard parts" like hinges, brackets, nuts and bolts. Yes leaves a slight "texture". On a side note... high build primer does wonders.
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I would try and stick with media that doesn't have silica in it unless you have a good ventilation set-up. That leaves out all types of sand.