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The problem with sand blasting is that it is very abrasive and erodes the
metal. Bead blasting is less abrasive but requires a blast cabinet, so you
can't do big pieces. You are better off dry ice blasting for sheet metal.
Dry ice leaves no residue behind and does not erode the metal. It causes a
thermal reaction, and since dissimilar particles expand & contract at
different rates, they just flake off rather than being pounded off. This
works on paint as well as rust. Also, the blast material evaporates leaving
nothing behind. You can strip an entire car this way. Just put a drop cloth
under it to catch whatever falls off.
The down side of dry ice blasting is that it requires much higher pressure
and is very loud. Other than that, it's great.
BTW, there are plenty of places that sell the dry ice pellets used as a
blast medium. However, dry ice has a short shelf life, so you have to buy it
when you're pretty much ready to use it.
And these guys for dry ice blasting equipment:
http://www.iceblast.net/
http://www.dryiceblasting.com/
http://dryiceblasting.zl1.net/
-----Original Message-----
My Elky is pretty solid but I've got surface rust in more places that I can
count. Should I just invest in a sand blaster and teach myself how to use
it or pay "X" amount of dollars to have it professionally done.
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