Generally speaking Lumacept™ is applied over normal walls already painted with standard latex. Every available paintable surface on the walls and ceiling of a room is a candidate for Lumacept™. The more surfaces that are coated with Lumacept™ the greater the UV-C intensity in the room. Don’t paint the floors unless for some reason you don’t expect to walk on them as floor coatings are designed for far more abuse than interior wall latex paint. It’s not usually practical to paint over a window and it might not be aesthetically pleasing to paint a stained door with a white or pastel color. Some patient rooms have lots of essential objects on the walls that cover the paintable surfaces too, but just remember the more surfaces you cover with Lumacept™ the better the results. Remember that you can apply Lumacept™ thin to be cost effective, which means you should first pre-paint the surface with a tint-matched standard latex (and primer for difficult surfaces) so you don’t have to apply Lumacept™ to a thickness needed for visible hide. Painting over already painted walls or new constructions drywall is pretty straightforward, but if you want to cover surfaces like vinyl wallcoverings take care to make sure you find a primer that has good adhesion first. Lumacept™ is not intended to be applied directly over hard to paint surfaces like bare brick, cement, metal, plastic etc. We do not guarantee adhesion. Primers compatible with interior latexes are strongly recommended when applying over difficult surfaces.