Repainting car bumper due to chips - how much sanding?

enwhyRFD wrote: ↑ I sanded the worst spots where the chips were the largest.

Do I need to sand the entire bumper down to bare metal? Or enough to get adhesion with primer, even if there are still chips that can be felt, and those would be filled in by the primer?

Just wondering how much more sanding I need to do...

Not looking to do a showroom job, just good enough to not be noticeable after repainting is done.

BeaverLiquor wrote: ↑ Unless you're car is form the early 90's or earlier, it's highly unlikely you'll find a metal bumper under the paint, if you do see metal you just put a hole in your bumper and sanded to the rebar.

MyGoToUserName wrote: ↑ Filler putty would the simplest fix. Then sanding smooth.

What vehicle are you working on and are you planning to paint the entire bumper with a rattle can or paint gun?

enwhyRFD wrote: ↑ 2010 Honda fit. Can. No gun.

The front edge of the hood has a 3" inch rust spot that i want to fix, so might as well do the bumper at the same time.

Also just so many chips and pits to fill so was hoping to avoid manually filling and sanding one pit at a time...

enwhyRFD wrote: ↑ 2010 Honda fit. Can. No gun.

The front edge of the hood has a 3" inch rust spot that i want to fix, so might as well do the bumper at the same time.

Also just so many chips and pits to fill so was hoping to avoid manually filling and sanding one pit at a time...

MyGoToUserName wrote: ↑ The bumper is plastic then.
It will be far more efficient to fill the damage and sand smoothly than it would to sand every stone chip down. A putty knife will do most of the work for you.

You can fill every spot at the same time, sand it smooth and move onto primer. Final sand then paint/clear.

Just be aware painting a large area like that with most rattle cans will end with a blotchy mess. Rattle can clear generally doesn't spray evenly. For a 3 inch spot you'll be fine.

2K clear being the exception, cans cost roughly double your typical 1k clear cans cost, but spray pattern is more even and because they include a hardener activator you end up with a more durable and UV resistant finish. Once activated the can is good for roughly 2 days.
It is worth researching if you want more info on 2k clear.

cartfan123 wrote: ↑

2k clear is a great product but you must use ***proper fresh air mask and ventilation techniques. A plain old N95 isn’t going to cut it. It’s highly toxic. Personally the health risks are too high for me.

Jigsaw wrote: ↑ great job op, how much did the project cost?

rngun wrote: ↑ Did you sand by hand?