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Old 01-11-2005, 07:59 PM
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Media blast, which media?

There are plenty of posts concerning how much damage one can do with sand blasting on sheetmetal panels. Not only can the panels warp from heat, but they stretch from the sand hammering the surface and the surface work hardens.

If one uses glass bead, aluminum oxide, walnut shells or something different, is the process viable on rusted or painted sheet metal? I see a number of products offered for sale each with different optimum uses. Are any of the available medias okay on sheet metal panels.
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Old 01-11-2005, 11:30 PM
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glass bead

My experience with glass bead has shown that it won't strip off the paint. Before using glass bead use a paint stripper on the metal.
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Old 01-12-2005, 01:02 AM
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Will glass bead media remove rust? Eastwood rates Aluminum Oxide or Silicon Carbide as better medias for rust and paint. Will these damage sheet metal? I understand that blasting is like pounding the sheet metal with a zillion little hammers so it can do a lot of warping and work hardening, just like overworking with body hammers can do. There's lots of posts in the archives concerning media blast gone bad. I want to know if medias other than sand are less harmful but adequately effective.
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Old 01-12-2005, 06:36 AM
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We have a cabinet at work for cleaning printing press parts, and analox's....We use a plastic media in it.

It is great on aluminum parts.

It will take paint off, but doesn't do much on rust. It takes the scaley rust off, but doesn't seem to get that deep down stuff.

The guy that set up the cabinet said that this media is what the Corvette guys use on their fibreglass .
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Old 01-12-2005, 11:37 PM
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You don't have to rely on one media. It is quite reasonable to strip the paint with a milder media and switch to something more agressive for the remaining smaller areas of rust or corrosion.
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Old 01-14-2005, 08:56 AM
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Water

There is a guy near here who water blasts boat bottoms to remove bottom paint. I have no idea how that would work on anything else... has anyone else here heard of this?
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