Scrub it with warm water and a sponge sander block.
you can paint over latex paint with latex enamel.
Rustoleum is a brand name; however, as long as the surface is clean, oil-free and dull, you can paint any oil or latex based paint over a latex surface.
Yes
You can use either enamel (oil-based) paint or latex (water-based) paint. If you are using latex paint, you need to use a primer (undercoat) first. The paint store will have a special primer that allows you to paint latex over enamel. If you are going to do this, it is also a good idea to either sand the enamel paint before you paint over it, or wash it with TSP (trisodium phosphate) cleaner to remove the gloss.
Yes, oil based paint is very versatile and can be painted over many painted surfaces, including those previously coated with latex paint, as long as the surface is dull and clean.
You can use either a water or oil-based paint over a latex primer.
There are some water based coatings that will adhere to an oil based surface without using a primer; however, an oil or acrylic-based primer, used as a bridge, will allow you to paint latex over an oil-base paint trouble free.
You can always paint latex ( water based )over an oil based paint as the latex just dries on the surface. However don't paint an oil based over a latex paint. Oil based paints need to absorb into the wood or other surfaces or it will just dry and flake off. For more information on the differences and when or not to use a latex or oil paint please see the following article. . http://www.ehow.com/how_4713170_between-latex-oil-base-paint.html
Yes it can.
yes but you cannot put latex on top of oil based surfaces You actually are NOT advised to put oil over latex surfaces, which is why you're supposed to prime will an oil-based (alkyd) primer. Latex and Polyurethane should always have a layer of oil-base beneath it.
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.
You cannot paint over slightly tacky latex paint with a water based polycyclic finish. You should always wait until the latex paint is thoroughly dry before painting over it.