How do you block sand a car for spray painting? Done most of the sanding on the car before I primered it. Do I block it now? Was thinking of spraying it a layer of black before blocking, but then must I primer it afterwards again. Also, I'm blocking with 120 grit sandpaper I buy in strips with a straight wooden block. Do I sand it down afterwards with a 400 grit for spray painting? Car going to be charcoal so I need to get out all the dents and stuff.
The dents should have been filled before priming really. If you put a lot of primer on then 120 should be ok and rubbing it back a lot should help you get a good flat surface. The black to highlight low spots doesn't need priming again - it's just topcoat same as what you are spraying over it anyway. I would go over the lot with 320 to get a final finish before topcoat.
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Most you want to sand primer with is 320 grit, Then water sand that with 800.
If you are priming the car then 120 on a flat long block everything and red scotch anything you cant sand down, primer the car, leave to dry, use a light coat of black to act as a guide coat. 320 (dry) the primer off, then wet 800 the primer(to remove the 320 sanding marks)
Clean everything, masking car, re clean, then paint.
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Most dents are out, or all the dents I can see with my eyes are out. Just a bit scared that when I finished painting I see dents then.
What's why you use a guide coat over the primer, it will show all the high and low spots.
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