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Sandblasting problems, need help

post #1 of 3
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Hello,

I'm new here and was wondering if some of you could help me with my current problem:


I purchased a 20 lb sand blaster from Harbor Freight (this one), I also purchased a 25 lb sack of glass bead media (this stuff). My goal is to completely sandblast my Coolermaster HAF 932 so I can later paint it.

I followed this video here from youtube: film_go.pngYouTube- Case Mod: Paint Computer Chassis, www.mnpctech.com
I went about using the sand blaster just as they did. However, after using more than half of my 25 lb sack of glass bead media, I was barely able to get through 1 panel (1 side only). I don't know what I'm doing wrong. I have an idea my air compressor might not be adequate enough for this project. I have a 25 gallon Craftsman Professional air compressor, it pushes 8.6 SCFM @ 40 PSI, and 6.8 SCFM @ 90 PSI

I was shooting the media at around 85 PSI, primarily because the air filter I was using on the line said to not exceed 90 PSI.

I don't know if the media I'm using is coarse enough, or whether my PSI is too low. In the video, he uses an 80 grit media as well, however, fails to mention which type it is. I did notice the media was of brownish color, maybe it's walnut shells? I know it's not the same media I'm using because my media is white in color.

After he was done blasting, his panels were rough to the touch, mine were smooth......... not a good thing for a high build primer to try and stick to.

Could it be that my 20 lb blaster is too small? I notice most people get the 40 lb version, I was just trying to save some money being that the 20 lb blaster was on sale for $60 vs $100 for the 40 lb blaster.

All I know is that after completing 1 half of 1 side of a panel for my case, I've already blown through more than half of my 25 lb sack of glass media. I cannot afford to go through this much media, due to the fact it costs $25 per 25 lbs.

So I'm asking what you guys suggest I do?

I'd appreciate any help that can be provided.
Edited by Jinto - 6/11/10 at 1:39pm
post #2 of 3
I would say it's the media.Glass beads are for fine work,and walnut shells heavy.FYI,if you can save it,you can re-use the media.My experience is in a booth,where the sand is recycled.If you can enclose your operation with plastic or something,might help you.Also you shouldn't have any problems with paint adhesion as long as the surface is free of any media,whether rough or smooth.
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RCPC#1
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Corsair H60 Windows 8N IBM 9494 19" LCD IBM 
PowerCaseMouseMouse Pad
Corsair GS500 In Win H-Frame Wolfking OCZ Behemoth 
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WD Black 1TB SATA III Samsung BD Zalman 9900MAX Windows 7 64 Professional 
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post #3 of 3
Glass bead isn't the best for removing paint and it is designed to not remove the underlying metal. It is fairly recyclable so you can probably get another round out of the glass beads you already used. Alu Oxide is better for etching and removing paint from steel. This chart is a good reference.
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