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Well lets start of with:

Is it a new bumper or an old one?

Is there any damage that needs or was fixed?

If its a new bumper theres need to sand so coarse.... You could probably hit it with 800 then prime and paint.

If its already been painted and you're just repainting it there probably isnt much of a need to go with primer so you could probably skip to 800 and color.

Somewhat more importantly, what are you painting it with? Different products require different prep.
 

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Discussion Starter · #4 ·
this is a 92 rear bumper. it has some paint scratches two are deep some are just surface. its blue right now and i will need it to be black. The paint i will be using is the stuff from automotive touchup or paintscratch.
 

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Fix the scratches and prime them. I wouldnt sand much coarser than 220 though.

-Get some glaze and fill the deep scratches
-Finish the repair with 320 and apply some primer to the repair areas.
-Sand the entire bumper incl primer with 600, followed by 800.
-Apply your color, followed by clear.
-Cut and Polish if necessary with 1000/1500/2000

There's no need to sand higher than 800 before color as you're putting something on top of it anyways, making the scratches slightly smaller wont do much in terms of changing the texture after paint, thats where spray technique, product and conditions really come into play.
 
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