Quoted: what do you need to sand blast?
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A) An air compressor
B) Go to Home Depot and get a Husky sandbaster gun for about $12, an extra screw in type male connector with a hose clamp and a nut that will screw on the connector(nut is in the plumbing dept.), a five gallon bucket and a $6 bag of blasting sand.
Drill a hole in the side of the bucket at the bottom, screw in the air connector and tighten it down with the nut on the inside of the bucket. Attach the black hose that comes with the gun and tighten the hose clamp. Fill bucket with sand.
Voilà -Instant sandblaster for under $20 ...
I use a face shield and a big plastic trash can to catch as much sand as possible for reuse, use a piece of sreening to screen out any debri that gets mixed with your sand ...
Quoted: Can you just use Gunkote over a parked finish?? or do you need to blast it off??
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It works best over park, if you can't park first then use K-Phos ...