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HOW I MIRROR FINISH A BAR
I start with an 80 grit flap disc on my angle grinder then I use my drill with 50 mm round sanding discs . I start with 150 grit then go through the following Grits 240-400-800 Then once I get to the following Grits I use a small squirt of WD-40 1200-1500-2000-2500-3000. The WD40 helps to lubricate the discs and stops the sanding disk binding up with the metal powder . Then after that I use my buffer wheel on my bench grinder to get a perfect mirrored finish on it.
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