Semigloss
Semigloss paint reflects light, making your bathroom shiny. Unlike a gloss sheen, semigloss does not show imperfections, so you can use it on blemished walls. This sheen of paint has long lasting power, meaning you won't have to repaint. It stands up well to moisture, making it an ideal sheen to use in moisture-prone bathrooms. Use this paint either for bathroom walls, bathroom cabinetry or both.
Gloss
Gloss offers many of the same qualities as semigloss but with more sheen. Gloss shows any imperfection in a room, so should only be used on bathrooms that have no blemishes or marks. Glossy paint comes clean easy and has natural moisture resistance. Use glossy paint for your bathroom walls, or incorporate it into bathroom trim or molding.
Satin
If you don't want shiny bathroom walls, choose a satin sheen, which has low gloss but offers many of the same advantages as the semigloss. Like semigloss, satin can withstand the amount of moisture produced in the bathroom. Satin paint also withstands dirt, mildew and stains, and can handle repeated cleaning. If you want a low gloss paint, this one works best for bathrooms.
Primer
Primer helps paint go on smoothly and can help neutralize the walls if you're transitioning from one color to a different color. If you don't prime walls, some areas may soak up more paint than others for a blotchy effect in the finish. Use a primer with your bathroom paint, no matter what sheen you choose, to have a smoother finished product.