No. You must sand the gloss of and them prime and then paint. Semi and High Gloss is only meant for wood not dry wall. Its the worst idea ever to put a gloss on dry wall. Any paint with an Enamel is just as washable.
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If you are going to paint over it you should prime it first.
Satin is lower gloss than semi-gloss paint. Paint finishes in order of decreasing gloss are: * Gloss * Semi-gloss * Satin/Low sheen * Flat Some manufacturers call Satin/Low sheen finish Eggshell, and others regard this as a finish between Satin/Low sheen and Flat paint. The higher the gloss finish the easier it is to clean, the higher its durabillity and the more it shows surface imperfections.
Yes. You can paint semi-gloss latex paint over flat latex paint. It is not advised to paint over any latex with any oil-based paint. Nor is it advised to try and paint over semi-gloss paint with any other finish without first de-glossing the finish and priming.
If you mix a flat and semi-gloss 1:1 you should end up with a paint in the eggshell range. Mix the same paints 1:3 and you should end up with a satin. Experiment with small amounts to get the desired gloss.
They include flat (matte), satin, semi- and hi gloss. It depends on if it is oil or water based. Varnish & stains offer different sheen options, also.