Prepping new bumber covers
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But just think of the time you are saving by finishing off in 600 and not having to seal a new part :whistle:
Norton 600 sanding sponges work good dry for this even 800 grit
I think GM recently changed their primer . The primer seems rock hard and does not sand/scuff real well.
I am using a DA with 400 then going over that with 600 DA and a red scuff pad.[quote=”hating-painting” post=33685]I think GM recently changed their primer . The primer seems rock hard and does not sand/scuff real well.
I am using a DA with 400 then going over that with 600 DA and a red scuff pad.[/quote]It’s been that way for years
Most of these new primed bumpers the sealer will stick or bite in to, the problem is you dont know witch ones do and dont. For that reason I use 400 and red scotch brite, seal and paint. I find that the GM stuff is all diferent primers from one bumper to the next.
I usually use 400 and a red pad too, but on some of them the primer is so thin I’ll use 600 (like mazda, VW, BMW etc).
Honda probably has the hardest primer. You could probably prep it with a grinder…
I see every variation out there. It’s always best to check your paint manufacturers tech recommendations on primed and raw bumper prep but a lot of times their recommendations include buying more of their branded products. For a primed bumper, I like a Mirka red scuff pad with any blend prep paste, I prefer Presta Scuff Stuff. For a raw bumper, same process just with a gray Mirka pad. It’s a very fast and thorough process and it cleans as well as provides excellent adhesion.
I tried a red scotchbrite and scuff stuff on the one before this one and I just wasnt confident it was enough. I was also a bit worried that it may have some imperfections I would miss without sanding it.
This one turned out decent. And lucked out cuz the color even matched.
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