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Tool Talk Discussion Forum

Sandblaster Question

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Glenn FitzGeral

06-11-2005 20:00:48




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I haven't used that many sand blasters but what is the difference between the pressurized tank type and the ones that simply draw the sand from an open pail? Does one work better than the other? Thanks, Glenn F.




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fepo

06-13-2005 07:13:58




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 Re: Sandblaster Question in reply to Glenn FitzGerald, 06-11-2005 20:00:48  
I just did a job this weekend, removed paint on underside of cement balcony. I have an 18.5CFM 3 piston compressor and the HF pressurized sand blast pot. It got me no where on this job. Went through 1 bag of sand and only did about 6"x36" area !! nozzle is too small to go any faster, and paint on cement sticks on hard. (I had an extra fan running to cool compressor heads, but compressor keeps up no problem, just is constantly running while blasting.)

I then rented a small 85CFM screw compressor and 1 bag blast pot -Linday, I was done in 2hrs, area: 4'x25', 3 bags of sand.

But the HF pot was good for cleaning paint of a steel railing, did a nice job.

So moral of the story, please dont paint cement, use silicone type sealers but no paint, cement needs to breath, and all paints will eventualy peel off.

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TimV

06-12-2005 06:54:50




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 Re: Sandblaster Question in reply to Glenn FitzGerald, 06-11-2005 20:00:48  
Glen: Redd Tom pretty well hit the important points, but to expand on his comments, the siphon (suction) type are also much more prone to plug-ups as they use the venturi effect (similar to a carburetor) by using the moving air to suck up sand, whereas a pressure type pushes the sand out the nozzle. I have a cheapie Harbor Freight suction type and while it"s certainly been worth the $10 I paid for it, they are very frustrating to use on larger projects because they will "skip" due to small plug-ups in the sand. This is especially true if your sand has any moisture or impurities whatsoever. Pressure units are far better for anything but the smallest of projects. For instance, I cleaned up the gas tank on my Maytag washing machine engine with my small unit, but for larger projects I borrow my neighbor"s 100-lb pressure pot. If you"re doing anything larger than a couple of square feet, you"ll be much happier with a pressure-fed unit. Also, bear in mind that sandblasters are one of the most air-intensive tools you can own, and if you have a small compressor, expect to spend more time waiting for it to catch up than you do sandblasting. Even a small unit will exceed the capabilities of a standard "home use" (25-gallon or so) air compressor for extended blasting.

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Redd Tom

06-12-2005 06:24:54




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 Re: Sandblaster Question in reply to Glenn FitzGerald, 06-11-2005 20:00:48  
A siphon feed blaster is the least expensive and is ok for light and spot work. I feel it also is the least efficient using more air to get work done. The pressure or pot type uses air to pressure the sand and is better but costs more. I use a 300lb pot with a 125 cfm screw compressor. It gets more work done. Either way they both use a lot of air. I have a small plastic siphon type from Sears that I used with a 4hp sears compressor and the compressor would never shut off.

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