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Old 02-09-2013, 06:54 PM   #1
p951951951t
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Join Date: Mar 2011
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1972 Alfa Romeo GTV
Alfa Rosso

Default Frustration abounds. Burned my paint with a rotary

So I've been working the car over with a rotary. I was using some meguires medium cut (#7). Everything was just peachy on the door.fender, then I got to the bumper. I hit it a couple times to try and remove some of the pitting. I wiped off after the last pass, and ****, I could faintly see the black color of the bumper showing through.

The paint on the bumper seems MUCH thinner than the paint on the rest of the car.

So, a lesson to all you out there who might decide to rotary polish your car - CAREFUL ON THE PLASTIC PARTS!
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Old 02-09-2013, 11:59 PM   #2
fr_awd
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Yep. I had a repair guy attempt to repair some razor blade marks on my bumper. After 1 or 2 pass with some rotary machine, he stopped and showed me the black mark. The clear coat and paint is really thin on our cars.
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Old 02-10-2013, 01:25 AM   #3
neomax
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Not sure of what training you have with a rotary..... As you know our paint is thin by normal standards. However, when using a rotary you must also be aware of not just the paint thickness but the material you are working with. The door is metal which can disperse heat quickly, the bumper is plastic, it will retain that heat and you will burn through the paint very fast. The is especially true if your using a heavy cutting pad and cutting compound....
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Old 02-10-2013, 07:09 AM   #4
p951951951t
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Quote:
Originally Posted by neomax View Post
Not sure of what training you have with a rotary..... As you know our paint is thin by normal standards. However, when using a rotary you must also be aware of not just the paint thickness but the material you are working with. The door is metal which can disperse heat quickly, the bumper is plastic, it will retain that heat and you will burn through the paint very fast. The is especially true if your using a heavy cutting pad and cutting compound....
I was using a 6" microfiber pad and the meguires medium cut (7). I've had a hard time figuring out the properties of that particular formula. It seems very inconsistent, but I'm not sure if it's my technique or the compound itself.

Either way I will only be using the light compound at most (5) on the plastic parts.

I still have to hit the burned section with a swirl remover and machine polish, but I'm going to use a RA buffer instead of the orbital and go as light as possible.
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Old 02-10-2013, 07:31 AM   #5
p951951951t
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Pictures of the damage:





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Old 02-10-2013, 09:47 AM   #6
I WANT AN STI
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thats definitely unfortunate man. But look at the bright side, lesson learned. We all have learned that lesson once,it happens to the best of us even with light polishing compounds. You have to go either A, extremely slow or B, extremely slow and light. I normally dont even bother trying to use a rotary on bumpers even with a micro polish and a polishing pad unless I have painted it personally or it has been sprayed in the shop I work in, since I know there will be multiple coats of clear that wont burn through so easily. I try and stick with hand polishing or super duper light buffing on bumpers.

You may be able to get someone to spot that in if they know what they are doing with melting the clear and matching that color with a little soft line backtape on the body line. Only problem is its right next to the fender so you may have a little mismatch, but our bumpers rarely match from the factory anyhow so that should be of no real consequence.
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Old 02-10-2013, 01:02 PM   #7
p951951951t
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1972 Alfa Romeo GTV
Alfa Rosso

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Honestly I may just do a respray on the front end next year. There is some damage to the lip area from the PO anyway. I had an alpine white 86 944 turbo a while back - I had the front end done at the shop where I used to work (PPG paint system) and the paint came out nearly an exact match. I can't imagine this one would be anymore difficult.

the only reason I was working so hard was because of all the pitting. I was able to remove most of it on the front of the fender so I kinda assumed I would be able to get to the same level safely on the bumper. That is not the case.

It's definitely a lesson learned, I'm pretty new to using a rotary so I guess I got a bit cocky. Too bad it couldn't have happened somewhere less obvious!
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Old 02-10-2013, 01:09 PM   #8
D. FiSioN
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Used some 3M P1200 and got mine a little to much on the 90 degree edge where the trunk meets the quarter. Took off about a 1/16th to the primer on the quarter side. Aaaaahhh! Delicate there.
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Old 02-10-2013, 03:05 PM   #9
I WANT AN STI
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yea man anything with sharp edges gotta be super duper careful.
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