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Old 01-11-2008, 08:24 AM
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Sand Blasting

I did a search 1st but no luck. I guess I could of look longer.

Which one is better or do you prefer?
Gravity or pressure tank for sand blasting.

Thanks,

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Old 01-11-2008, 08:58 AM
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I like a pressure tank myself..seems to do a much better job..

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Old 01-11-2008, 11:27 AM
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The metal is warped by having the sand beat on the surface causing the surface to expand. The whole idea with sandblasting is to limit the energy of the stuff hitting the surface such that it will remove the bad stuff and not damage the metal.

There are two ways to put too much energy out.

First is with too much pressure. If you have too much pressure every piece of sand will cause damage. I run my pressure blaster at 40PSI.

Second is lower pressure with too much sand. The more sand in the stream the more energy you have to beat the surface until it warps. I turn my pressure blaster sand valve off and just crack it until I see sand flowing in the airstream.

I have never warped a panel with the above settings. I have warped metal on purpose experimenting.

Why you ask this makes a difference in the type of blaster...

A siphon blaster does not generally have a means to regulate the flow of sand. It is possible to warp a panel at 40 lbs because the siphon blaster will allow too much sand in to the stream. It is also not as efficient at using the media.

I hope that clears up the picture.
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Old 01-11-2008, 01:22 PM
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wet blasting

I bought a wet blaster fron Northern, did a quick test. we are now at the base of the uinta mountains and below freezing so will have to wait until spring to do serious chassis clean up blasting .my pressure washer will go up to 3500 psi on water only, it will peel paint,
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Old 01-19-2008, 05:34 AM
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I also use my pressure blaster at 40 psi and reduce the flow of sand. it works great and I have no warpage or damage to the panels. some people are completely against blasting and will tell you horror stories. it can be done safely and is a much quicker way of removing surface rust and old paint. do not use sand as your media it is to harmful to your health. I use black beauty also called black diamond. it is $6.50 for a 50 pound bag at your local tractor supply store. good luck
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