18 grit is about 1mm (or 1000 um)...you'd need a huge tip for that...not even sure that a standard dental size sandblaster could run something that coarse...
18 grit is about 1mm (or 1000 um)...you'd need a huge tip for that...not even sure that a standard dental size sandblaster could run something that coarse...
Always used 50micron for both Alox and Glass bead . With the .025 tip. Why? Because it works? And taught?. Walnut may be a larger grit? Not sure, more focused on Football today!!