Polishing Bumpers...

Kriminal

Kriminal

New member
Would you consider a PC7424 + Menzerna PO106FF to be a safe mix for polishing the plastic bumpers on my car ? :confused:



It's just that I hear sooo much about "burning", I'm a bit concerned that I'll mess things up :nervous2:
 
While I haven't used that Menzerna polish, I've used the PC/Cyclo/even rotary on the plastic bumper covers of our Audis with no problems at all.
 
How about with a rotary? Many of you warn about plastics when using a rotary, and for some reason I only think about plastic trim pieces, but does this include painted plastic bumpers too?
 
You *do* have to be careful because the plastic won't absorb heat the way metal will so the paint can get (too) hot...or at least that's what I think happens. But on the Audis it's just never been a problem for me. Note that I'm *very* careful and I don't crank up the speed though.
 
It shouldn't be a problem with the rotary. Just watch the speed and keep the machine moving quickly

The strongest I've used is 1500 grit polish
 
I agree, you can, but damn, be careful!



Front bumper on a Mazda Protoge5 was my worst error... Using a rotary, I was bending wrong or something, and caught the edge of the pad. There wasn't an edge on the bumper or anything, but the force of it catching ripped the paint right off (Since bumper paint is much softer than regular paint!!!)



I try to shy away from rotary on bumpers, but will do it if needed.



PC7424 with a 4" pad does great corrections on bumpers, and you can fit in many more places!
 
Phew ! That's great - thanks for the help (and tips). I just wanted to check with you guys before I go sending in pictures of what I shouldn't have done :2thumbs:
 
You can definitely burn the paint on a plastic bumper using just a PC. I've seen it happen and have personally demonstrated it to people on on a test bumper I had from a crashed vehicle. I've also had a couple vehicles come to me last year with spots of cloudy and or dirty gummy paint on their bumpers, which are classic signs of burned paint on plastic panels. I've always been able to greatly improve the finish to where it looks nearly perfect by hand polishing the area with ScratchX. It often takes me at *least* a half dozen applications, but it clears up that cloudy gummy dirty paint little by little with each application. I've tried to correct these problems by machine and I've had very little luck, even at the slowest of speeds, but working them by hand has been the best solution for me so far. On the vehicles I detail, I always use a rotary and or PC on plastic bumpers, but I always use them at lower speeds and definitely with caution.
 
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