How to repair scratch on bumper?

peoe

New member
Hello all, this is my first post! I used search and found lots of great info about repairing scratches. I hope this question is not too basic for you guys. I did a scratch on my front bumper with the metal part of a power plug. The plug felt from my hands and went straight on the bumper. Here are a few close-up pics. I'd appreaciate advice on techniques and products to use to get rid of this scratch. I do feel it with my nail even though it looks small. It is a sharp scratch right on the top of the bumper so has plenty of sun light on it.



DSCN2968.jpg


DSCN2972.jpg
 
well, what kind of equipment/cuts/polishes do you have available to you? you wont be able to completely remove the scratch, but you'll be able to make it much less noticable.
 
I have a PC 7336 (used it only once so fairly new to it) with blue and black Lake Country VC pads. I also have a Lake Country white "regular" pad . Along with that I have Meguiars mirror glaze swirl remover, Zymol cleaner/wax, Zymol creame wax and some 3M finess II rubbing compound (I believe finess II). I have a bunch of pads for applying stuff manually. It doesn't look to me like I have what I need and I'm willing to buy anything I need to get this scratch reduced as much as possible.
 
If you know how to wetsand I would give that a try go over it with some 2000 and then finish it with 3000 and then your pc and the 3m finesse II and then the swirl remover and to finish it off if there's still hazing the zymol cleaner wax. Thats your best bet IMO with the materials you have.
 
edit: just read the post above mine. id pick up a sheet of 2000, but if that doesnt cut enough, move to the 1500. if you want to play it safe, the 2000 marks will be easier to remove, but will take more work to take care of the scratch. i say try both, starting with the 2000...if no luck there, move to the 1500. as for the #9, i dont think that the swirl remover will have enough power with the pc to remove the rubbing compound marks. not only that, but i believe the dacp is a far better product whether its applied with the rotary, or the pc.



my advice would to pick up a sheet of each...1500, 2500, and 3000 grit sand paper. you'll probably have to order it online, but ive had pretty good success with that. since you dont own a rotary, i cant guarentee you'll be able to get out all of the wetsanding marks. however, the scratch is somewhat small, and as long as you dont cut too deep, you should be fine. i followed that procedure to remove some orange peel from my repainted honda, and managed to get all of the scratches from the 1500 grit paper out. i know megs recommends their hi-tech wash for wet sanding diluted 1-1, and it seems to work very well.



is the finess-it 2 compound rotary only? i picked up the 3m medium cut (which i assume took the place of the rubbing compound), and while it cuts very well, youll need something to follow it up. i recommend picking up a bottle of megs mirror glaze dacp (dual action-cleaner polish) for a final step. since you are just trying to remove the scratch, i wont recommend any wax or sealant to go over the dacp, ill leave that to you. id also either pick up a lake country orange pad at first to see if that does the job. if not, pick up a yellow pad for the rubbing compound, and follow it up with the orange pad with the dacp. anyway, heres the procedure id follow.



1. either wash the entire car, and dry accordingly, or qd the spot that youre intending to compound.

2. mix up the wetsanding solution, and start making a few passes with the 1500 (check after every 5 passes to make sure you dont cut too deep, wipe with a microfiber prior to checking)

3. once you believe youve removed enough cc to make the scratch less visible, repeat the above process with the 2500 grit, although this time you wont be checking for the scratch, you will just be trying to even out the sanding marks.

4. follow that up with the 3000 grit, and make sure your sanding marks are now to the point where they are very, very fine. there will be a good amount of hazing, but the sanding marks should be able to be to be removed.

5. wipe down the area, and qd it ready for compounding.

6. start off with the dacp on the orange pad (yellow polishing if you use megs pads), at speed 5...i assume you know how to use the pc correctly to remove defects.

7. if it removed the majority of the marring, but there is still some there...follow it up with another pass of dacp at speed 5.

8. if the light sanding marks are gone, but you can still see some...apply the 3m compound to the orange pad. 1 pass should be suffiencient. speed 5 yet again

9. follow that up with one or two passes of the dacp, on speed 5...if you are happy with the result, throw on the white pad with some dacp, and make one final pass.



if marring still is present after this, im going to say you may need to purchase a rotary buffer. the pc cannot always remove wetsanding marks, but i have been successful as long as i did not apply too much pressure with the 1500 grit, and made sure to follow it up with the others. read up on wetsanding, and how to properly do it. when wetsanding, only go in one direction, never in circles, or overlapping as it will make it much harder to remove. one last thing, when i say passes...i dont mean go over the area once. apply the product to the pad, and completely work it in. the dacp is a tricky compound to work with...takes awhile to work in, but its results are quite good with the pc.



just pm me with any specific questions, but im sure ill check back here just in case. good luck.
 
CelicaLover said:
If you know how to wetsand I would give that a try go over it with some 2000 and then finish it with 3000 and then your pc and the 3m finesse II and then the swirl remover and to finish it off if there's still hazing the zymol cleaner wax. Thats your best bet IMO with the materials you have.



Thank you for the great input. I am going to make things a bit harder, I've never done wetsanding so maybe will keep this as my last option. I'm afraid that with wet sanding I will damange the area around the scratch more than fixing it.



What do you think about Meguiar's ScratchX or Mother's ScratchRemover? I am willing to spend money on products I don't have if it makes the process easier. Thanks again for the input.
 
either of those scratch removers wont have enough cutting power to remove enough cc to hide that scratch. wetsanding isnt dangerous if you know what youre doing. as long as you stick with 1500 grit, and check every few passes, youll be fine. if you follow it up with the other grits, youll just even out the cc around the scratch, while inducing marring that can be removed with compounding. if the pc doesnt work, a rotary will. if youre worried about wetsanding, go pick up a hood or something, make a scratch on that, and try to remove it via wetsanding. if youre successful without inducing additional marring, you know you can be successful on your car.
 
In that 5th picture the one where you say:



And you'll probably be pretty nervous, but you're ok. As long as you were patient and sanded lightly you will not have removed more than a fraction of your clear. Just be careful!



It looks like you sanded right through the base all the way to metal in that pic. I know that pictures can be deceiving but how far down the paint did you wetsand? It appears that no paint is left around the scratch?
 
hes not even close to the metal in that picture, i doubt he even went through 1/2 of the clear. what you see is purely sanding marks, which can easily be buffed out via rotary. he mentions not to use under 2000 grit paper, when in reality you can buff out 450 grit if you have the proper technique. however, thats with a rotary. you need to be very careful when using 1500 grit when planning on trying to buff out with a pc, as the pc was never meant to be used for wetsanding, it doesnt always work. as long as you check after every few passes, you'll be fine.



just a heads up. i managed to buff out the marks when i used megs hi-tech wash diluted 1-1 as the wetsanding solution. if i used just pure water, i may not have been able to competely buff out 1500grit marks. if you are that worried, you can always start with 1500 lightly, move up to 2500, then 3000, then 4000. or, just buy a rotary...sand with 1500 grit, and buff out. i just want to reitterate that the pc was never meant to wetsand, so be careful when sanding.
 
To give you an idea how far I went down; I have a paint thickness gauge, when I bought the car that are read 12.1 microns, it now reads 11.7 microns; so I removed 4/100ths of a micron which is an almost inconsequential amount of clear. As you can see in the afters I had plenty of paint left. You couldn't find the scratch now if you tried.



And yes, you can get away with 1000 grit, even 500 grit if you have a rotary; I wrote that "how to" with "ease of use" in mind; so I'd stick with 200 grit which is readily available over the counter. A PC will take out 2000 grit marks easily.
 
Thanks all. That write-up is pretty impressive. What I ended up doing for now is jut fill the scratch with paint. I'll let it dry overnight and see how it looks outside in the sun.



I got the aero bumper for my car and still have the old bumper around. I think I'll use the old bumper to practice the sanding technique. Once I'm comfortable I'll move to the car.



By the way, what do you think about this, I saw it in another forum: http://drcolorchip.com/bmw-touchup-paint.html
 
Back
Top