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Sand,soda, or media:
I've used sand and media,just get it primered right away[Same day if possible] As rust will start before the blaster gets around the other side[not quite that fast]Yes it peens the metal and if blasted to long can weaken metal severely,but it is very effective at getting metal ready to cover.If any rust is left cut it out!So go for it,you will be pleased with the results,I was,Danny.
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