Sanding the damn bumper

[Dattebayo]

I just need some advise about sanding a bumper.

Never did it before, so whatever. What sort of grit paper should i use and what problems can come up? Is it different than sanding the metal or what. Thanks to all who reply in advance!

[Bluefire]

depends on what you plan on doing... If you sanding it to repaint it, then wetsand it well with 400 grit

-Bluefire

[Dattebayo]

can i use a circular power sander or does it have to be by hand?

[Dattebayo]

bumpage

[Doomed2Walk]

I believe you can, but I'd say go down to the local library or bookstore and get a book on DIY body jobs.

[Accord-240sx]

use 80 grit and then use 220 then use something higher like 400 or higher to get a smooth finish maybe after that use 800 and wet sand it.

[Dattebayo]

all these different answers are not very helpful.

I dont even know what to say.

[Philsnotfalling]

if you are repainting it only use a red scotch pad wet with some prep soap... unless its a metallic color ie silver or gold or alot of "sparkle" in the paint. In that case 400 grit wet will work perfectly. if you are repairing the bumper do not use anything coarser than 180. 80 grit is very coarse and will leave alot of "fingers" and will show through the paint and primer. if you are doing any sort of heavy repair on it use pirahna putty from 3m. its more flexible than bondo or polu putty. it does leave alot of pinholes. so once it is sanded where it needs to be go over the pirahna putty with a very thin coat of polly putty or metal glaze to fill in the holes. I also recommend using a plastic prep spray before you use a filler and before you primer. if you use a d/a to do any sanding use it sparsly and not in any tight spots. but what are you trying to do exactly?

[Accord-240sx]

if you are repainting it only use a red scotch pad wet with some prep soap... unless its a metallic color ie silver or gold or alot of "sparkle" in the paint. In that case 400 grit wet will work perfectly. if you are repairing the bumper do not use anything coarser than 180. 80 grit is very coarse and will leave alot of "fingers" and will show through the paint and primer. if you are doing any sort of heavy repair on it use pirahna putty from 3m. its more flexible than bondo or polu putty. it does leave alot of pinholes. so once it is sanded where it needs to be go over the pirahna putty with a very thin coat of polly putty or metal glaze to fill in the holes. I also recommend using a plastic prep spray before you use a filler and before you primer. if you use a d/a to do any sanding use it sparsly and not in any tight spots. but what are you trying to do exactly?

If you need to use a filler use Rage Gold Extreme(its like bondo but way easyer to sand) For priming i would use a Poly Filler(need a air paint gun) to fill any pin holes then sand it down with some 400 grit and then use a around 600 grit to wet sand.

this is me applying the polyfiller primer to fiberglass

[Dattebayo]

I try to click on those links, but it says

"File attachments can only be linked from the message board server; Outside linking is not allowed."

that suxx! I have a silver silvia bumper and im going to repaint it black (as i say in my sig). I want a smoother finish than just spraying it cold, so im going to sand off the road grime and paint before the application.