How to sand my bumper?

B

BONESTOCK

2012-09-29_16-59-39_416.jpg


As you can see the bumper is not really DA friendly in a bunch of spots.

Should I take this down to the plastic? The yellowish color? Also how do I get the spots like the corners where the center trim / body line would be? Use like my fingertip and push/pull in that direction till it's bare? Don't I need to worry about going the opposite direction as well?
 
I saw your tag on the end of my post asking the same thing, here's what I discovered.
I had about 3 coats of BB/CC and a primer ON TOP of my original paint and when I sand blasted I took off everything down to the plastic on one side but shifted to just talking off down to the original paint or primer once I had the pressure and feed rate (thanks to Shine) adjusted.
When I hit it with two coats of black epoxy it didn't seem to care which was what. I did my repair on top of the epoxy (3M 0801 panel adhesive) and just covered it first with the reduced epoxy as sealer before paint.
That's how I did it but *I* am just a novice and my bumper cover was more a guinea pig than a project.

If your just working with the original paint I'd guess you don't have to strip it all, maybe just the clear coat off???
Try to get the sanding pad off your sander and use it to hand sand in X pattern starting with some 150 if your 220 doesn't cut enough and then working finer. I find the the round shape helps get in some of those tight places.
 
A media blaster is easiest, sanding is a pita, don't use any paint stripper or solvent based cleaners on urethane - waterborne cleaners work best IMO, SPI epoxy is the best primer you can use.
 
For the hard to reach stuff and sound paint I use scuffing paste with a green scotchbrite.
 
I have 70 grit aluminum oxide media. Would that be to much for the urethane?
What about my fiberglass 3"cowl hood?
 
Do you mean you have media to blast with or it's 70 grit AO sand paper?
If you have the pressure low enough I think you could get there without cutting up the urethane too much. On mine it was pressure more than size of grit that 'does the damage'...
 
Yup. That's the media I have that I plan to use for blasting the car.
 
Or find a bumper recycler to do it for you, have them strip it but not prime it. LKQ is one nationally known companies that do bumper repairs/re-manufacturing. Check with the bodyshops in your area. I've had LKQ/Keystone strip urethane trans-am noses and bumpers in the past.
 
You must log in or register to reply here.
Back
Top