Make Your Own Sandblaster and How to Use It : 3 Steps
The setup is a normal air gun, with a hose at a second attachment. This sucks in sand at a constant rate, via Bernoulli''s Principle, like an aspiration setup in a chemistry class. Find a bucket of sand for the hose to rest in. Find some good method to keep the hose submerged in sand, like ducttaping the hose to the side of the bucket so that it''s always pointed downwards.