On 27 Feb 2012 16:19:18 GMT, notbob wrote:

Shop air compressors have oil and water vapor in them. Canned air
doesn't.

Just put / use an in-line filter on the compressor. It collects
moisture and oil. Keeps oil out of the paint gun and water out of the
sandblaster.

With no filters I blast the PC with my usual compressor blaster
nozzle.