If you have a bad drywall finish, you need to use a low sheen paint. the flatter the paint, the more it will hide inperfections in your drywall job. However..flat paint has a low washability problem....
The best paint that I have found for interior and exterior is BEHR: glidden and color place smear which means that as you apply it, it is taking it off again if you brush over the same spot. BEHR...
You can paint pretty much anything with interior paint. You could use it to paint walls in any room of your house such as the kitchen, bathroom, or bedroom.
Interior doors see a lot of "wear and tear" so it is best to use a paint that has a hard surface and can stand up to washing. In the past trim-work and doors tended to be painted in an oil based...