Polishing bumpers how to?

[camip]

I used a angle grinder to get the clear shit off now I'm fucked and have hella scratches.

[Keith M]

They will sand out but it will take a lot of work. You might be better off finding another bumper and go from there. I restore vintage european cars and have done a ton of polishing so text me if you have any questions.

[E30_Pare]

I used a angle grinder to get the clear shit off now I'm fucked and have hella scratches.

Ruh roh! Yea I think u fucked up bro. Tough ain't it :/

[V8E30]

V8e30.. Looks great man! I was afraid you would run into that problem with the oven cleaner, like pare said it is very thick on those bumpers, i have only ever used it (succesfully) on bicycle parts.
If you use more varied grits of sand paper between 400 and 2000, youll get even better results. It is very hard to get out the 400 scratches with 2000, in the least use 400, 800, 1500, 2000. Always be sure to clean your bucket and start with fresh water when changing grit..
Looking forward to pics on the car,

might go back with like 800 and see if it takes some more of the small scratches out


thanks man!

[E30_Pare]

I did a ton of step sanding & the result was a super shine. Yours looks good too. I'll repolish mine since its off the car so u can compare

[camip]

Please do I've busted ass getting most the scratches out. But there still some.

[slaterd]

Come on guys! Put up some pictures

[camip]

I will when I get off work. I've learned through trial and error no chemicals take off the clear and grinders and belt sanders just add work and flat spots.

[slaterd]

I tried doing this a while ago with a front marker delete. But all I managed to do was polish the coating on the DB. I need a mirror finish on my car!

[E30_Pare]

Looks clean atleast

[1craze30]

http://mysite.verizon.net/

vze7aq8e/id16.html

Great site, on how to refinish bumpers.

[Voyd]

I wish I saw this post before you took the grinder to the DB"S. I had a set of Forgeline wheels that were anodized black when I bought them. My goal was to polish the forged aluminium to a deep shine. To make matters worse the anodized coating was a couple of mils thick with a poly clearcoat as well.
I stripped the clear with this:


I then bought some of this:


from Casewell Plating. It is Sodium Hydroxide (Caustic Soda Lye) and comes in a powder form. I then added it to some water and dipped the wheels in a bath of it. I can't recall the mixing ratios and time as this was two years ago. When I pulled the rims out of the bath I had pure virgin aluminium.

At this point I started to polish each wheel. I used a hand drill, Sissel buff's and aluminum grease-less compounds and Tripoli polish to get a mirror shine. But sand paper will work as well. My main point is that you need to use the Sodium Hydroxide to get the anodized coating off. I tried to sand it and it was never coming off.

[camip]

Finally! Someone has found a way!

[1craze30]

How much did the sodium hydroxide cost you?

[E30_Pare]

Would that work on chrome? Looking to strip my euro bumpers/weaves. I read somewhere that bleach could strip chrome off plastic, but unsure about metals