What sanding grit to use to repaint a bumper cover to different color?

1998 GMC JIMMY
160,000 MILES • 4.3L • V6 • 2WD • AUTOMATIC
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ROYCAR71
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I replaced my bumper cover with a bumper cover from a salvage yard with different color and did body work. Now I want to repaint it to the color of the base color of my car what sanding grit do I use to scuff the whole bumper to prime it and then repaint it?
May 26, 2015 at 1:52 PM
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HMAC300
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you have to use special primer on plastic prior to paint. scuff with either 320 or 400 grit prior to primer then rescuff with 400 after primer
May 26, 2015 at 3:12 PM
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ROYCAR71
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Does this exclude Rustoleum's sandable primer all purpose fast drying primer?
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May 26, 2015 at 3:55 PM
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HMAC300
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yes it does rubber bumpers take a special adheshive type primer a lot of major auto parts have it with their duplicolor stuff
May 26, 2015 at 4:04 PM
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ROYCAR71
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Lastly, is it ok to use grease and wax remover over the finish bondo repair?
May 26, 2015 at 4:17 PM
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HMAC300
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bondo shouldn't need that only rest of bumper of course it should have been done prior to starting.
May 27, 2015 at 6:52 AM