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.
Answer: You can, but it will peel off. It needs to be lightly sanded.
Latex bonds to latex, regardless of gloss.
You could paint over it even without a primer.
A fine sanding or the use of a de-glosser will give the primer tooth.
Semi-gloss paint sometimes has problem sticking to walls that have a higher gloss paint type already on them. Usually, a light sanding and a coat of primer will help. Sometimes, semi-gloss paint peels if it was applied during high-humidity weather, as it doesn't dry all the way through.
Scuff sanding, that is sanding only far enough to break the gloss and produce a matt surface is not sufficient for blistered paint. If only the topcoat is blistered, it should be sanded off completely. If the primer is blistered, it must be removed too.
If you are going to paint over it you should prime it first.
It is never a good idea to paint anything high gloss without sanding first. You don't need to sand clear though the old paint, but the new paint needs something to hold onto. If there is nothing but a smooth, shiny surface, the new paint will probably run if the surface is not horizontal, and then chip and flake very early on. Always run a piece of sandpaper or a sanding block, 150 grit is good, over the surface. Why do something twice?
use a semi gloss or high gloss enamel as the hold up to scrubbing very well
Yes, but if it's the same base you don't even need to sand it.
depending on the surface finish of the primer. Noirmally its matt in its appearance and will take a water based gloss. However, a primer should have an undercoat applied first unless its a primer/undercoat.
depending on the surface finish of the primer. Noirmally its matt in its appearance and will take a water based gloss. However, a primer should have an undercoat applied first unless its a primer/undercoat.
If the black gloss is in good condition, there is no need to use primer. Wet sand it with 800 grit, and use wax and grease remover both before and after sanding. Be careful not to sand through the black, and respray the car with either a satin black or a satin clearcoat. Make sure the paint you use is compatible with the existing black paint.
I'm assuming your talking about house type paint and not something high end like car paint. If so, the answer is yes, but you must de-gloss it first to open pores in the old paint and give the new paint something to grip on too. To de-gloss, you can use sandpaper (150 grit and above is better) to "scuff" sand (just scratching the surface a bit, not really sanding anything off of the wall), or use a commercial de-glosser (such as krud kutter's "gloss off" etc...) which in most cases, you have to rinse off before repainting, but does do a more through job. If the old paint is really hard and shiny, you might have to de-gloss AND use an adhesive primer (also called "bonding" primer) first to insure your new paint sticks and doesn't peel.
Yes, you can.