Homax® Wall and Ceiling Textures like Popcorn Ceiling Textures and Knockdown Ceiling textures are ideal for use over properly prepared interior surfaces, including gypsum panels, concrete and plaster substrates. Homax Wall and Ceiling Textures are available in a variety of formulations for enhancing aesthetics, performing ceiling repair, and concealing minor surface defects in walls and ceilings to achieve an Invisible Repair®.