Stop in for a cup of coffee

Unconventional said

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Same idea from Harbor Freight.
Hook air to gun, vacuum at nuzzle sucks sand from bucket, rust and paint flee the scene.

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Had a similar one. Cut up a box, 6" square hole in bottom, sheet of glass duct taped to top and a hole for one arm. Reach in with gun,place hole over rust spot and blast away. box would catch most of the sand and very little would fly around shop. Worked very well.
If you buy a better gun,less air to do the same job.