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yes you can scratch paint off of anything with enough time
To remove a scratch on a plastic car bumper sand it lightly. If the scratch did not come out, fill it with filler. Next clean the area. Block off the parts of the bumper that you do not want to get paint on. Spray primer over the area and then finish with spray paint in the correct color.
Primers are not water proofers, in fact primers can't be left as the finish coat because they have no durability. If the paint acts as a primer how can you expect the paint to stand up as a true finish coat.
Cement can wick moisture from outside that will cause your paint to peel off. Look for a primer that will seal it first, then paint it.
DON"T try to scratch it off ! Use basic paint thinner and you may get it off without any scratching.
Scrub it all off, sand the surface and paint a primer first.
Unless you used a primer in between it will look like it's slipping off.
yes you can
You didn't mention whether you were using latex or oil based primer and paint, but generally the point of using primer is so that you can paint over it with any form of wall paint. Just read the label on your primer can to make sure it is compatible. On the other hand, if you wanted to paint the primer over the satin gloss, you need to sand the surface lightly to remove the sheen of the paint and provide a suitable surface for the primer to adhere properly.
Besides a few shades of black, white primer will reflect more light back than a gray primer under a paint color that doesn't cover well. Gray is often used under dark reds which would normally require several coats of paint to cover, The lighi that would normally be reflected from a white primer underneath the paint is, instead, absorbed by the gray primer, giving the illusion of an opaque surface. White primer is used under any light paint that covers well. It can also be tinted to the color of many off white or pastel wall colors to help ensure coverage using fewer coats.
yes, the tiny dirt particles din into the paint and scratch it off
Not directly. You will need to use a primer made to adhere to oil and will accept a latex topcoat.