https://rodsshop.org/auto-body-paint/
This is a short video showing the basics and the easy steps of sanding a bumper where scratches and the clear is peeling. Then masked off and painted. This whole job took about 2 hours to do, there are videos saying you can do what you will see here in ten minutes. There may be a way to do it in ten minutes but good luck on the paint sticking..LOL
I will lay out the steps here. wash the vehicle or at least the bumpers and the surrounding area so that the masking tape will stick. Mask off any trim you don't want to scratch when sanding. Sand the scratches out and feather back the peeling clear is any by sanding. Sand with 400, possibly 320 for rougher areas but finish it off with 400. Re-mask your trim if damaged during sanding and then mask off the rest of the car.
Use a drop cloth over the entire car that isn't going to be painted. Be sure that there is no way the spray gun can blow up under the drop cloth, it will get overspray if you're not careful. Then use a midcoat adhesion, one even medium wet coat will suffice. Then spray your base color if you are using a base coat clear coat. I get asked how many coat of the base color, well the answer is as many as it takes to cover what you are spraying over and when you think it looks good, then apply one more coat. Worst case scenario would be 8 coats and that would be if the base has a lot of pearl or like spraying whit over red.
Then spray two to three coats of clear. Take your time, don't get in a hurry and get down at different angles to catch the light on each coat to see what your orange peel looks like. If you have achieved the same texture as what you are matching on the second coat, stop there. On this car, it turned out really nice so no buffing was required but if you do have to buff, wait till the next day before you do. Also remove all the masking about an hour, no more than two after painting. If you wait too long, the paint will become hard leaving hard jagged edges where the tape line was.
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