Kelly, I lied. I don't think this is what I have out in the shop. I went and got some bags of fine sand from Home Depot tonight, but then after reading about filtration of sand--to do it right is expensive, and to do it any other way just scares me. So I'm going to go with something with low free silica like this. The price is still pretty cheap.
And if this is as low dust as they say then it will be nice. I have aluminum oxide in my blast cabinet and it gets to be so dusty in there I can't see what the hell I'm doing.
I use crushed glass and like it a lot, I get it from a New Age Blast Media distributor for $8 per 50# bag. Course is good for frames, med 40/70 is good for sheet metal, and fine 70/100 is like baby powder--- good for removing paint by layers. I blast at 90 PSI normally, and cut it to about 60 PSI on the flatter surfaces. But that is on tri5 chevys, the newer cars with thinner ga metal will require lower pressure.
Take note of the instructions from New Age on using crushed glass, they actually recommend using less material.
Tips On Blasting With Glass Abrasive:
•You do NOT want a lot of abrasive in the air stream. The grains collide with themselves, lose energy, and hit your surface with less impact.
•Your goal is to not be able to see the abrasive in the air stream. If you can see it, meter back, as you have too much abrasive going through your hose.
•Start by purging your line so it is abrasive free. Then slowly open the feed until you can see the abrasive in the air stream. Then slowly close the feed until you can no longer see the abrasive in the air stream. This is what you want.
•If you have too little abrasive in the air stream, you will likely hear a high pitched whistling sound. Start over and this time repeat the process slower so you can see when the abrasive is no longer visible in the air stream. Be Stingy! You will achieve better results with a lean supply.
•Move your nozzle faster than you normally would. Glass abrasive blasts very fast, very clean. You will be surprised how light and sharp it is, and how much feathering you get with it.
•Blasting hard mil scale will require using a finer grit size, as it cuts more like a knife than a hammer. This is why it is great for softer, elastomeric coatings that often bounce back heavier abrasives.
•Blast at a 90 or 100 psi, or less. Higher pressure will be counterproductive due to how light glass abrasive is. You will simply shatter the glass rather than allow it to work for you.
•You can use a finer size than you would normally use.
•Estimate 5 to 6 lbs per sq ft usage. So a 1,000 sq ft area would require 5,000 to 6,000 lbs of media.
Tried Crushed Glass Media - Sandblasting - Contractor Talk