Generally there are two types of paints. Alkyd (oil) and polymer paints. . Alkyd paint is suitable for painting wood, metal and plastic. Applying prime on the wall before painting it is a must. In practice, after the ground coat is applied, the surface needs to be cleaned from the dust and then a very thin paint should be applied on the wall. The lack of primer could ruin the ground coat. Paints for different premises are of same base but they differ by their additional components – latex, teflon, silicone, etc.