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My powdercoater sandblasts everything before he coats it. it really helps the powdercoat etch to the metal. there are different abrasives and grits to use like sand, media, walnut shells, and tons of others to make the raw metal rough or smooth or anything in between. everything ive had powdercoated comes out pefectly smooth. there are probably plenty of powdercoaters that don't blast before coating but thats kinda like having your car painted at maaco for 200 bucks.
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