Interior paint is available in either oil or latex, and often a blend of both. Oil-based paint provides highly durable finishes but is more difficult to clean up after. Water-based paint tends to cover paints used previously, but it can be damaged by humidity and does not provide as tough a finish. Latex has the advantage that it cleans up easily and provides a washable finish. It is best to go with quality paint, though professionals can mix paints and finishes for your needs.