The adhesive blocks have a rubber-based, non-permanent adhesive that can bond and removed cleanly from all sorts of surfaces including wood, plastics, metal, powder coated materials, and painted materials. Surfaces may be slightly textured or uneven since the foam will mold to the surface with firm pressure. Painted surfaces should be in good condition and not show signs of flaking. Weakening paint means the block may tear away the painted surface when removed. We don’t recommend installing posters on wallpaper since the blocks may tear away the surface when removed. Test in an inconspicuous area before you install. Also, glass that allows the adhesive to be exposed to sunlight will, over time, diminish the block’s holding power. (PIC 2-1)
You should clean the surface according to the surface manufacturer’s instructions. If unsure, at least wipe the area down with a dry, lint-free cloth to remove dust. (PIC 2-2) On most surfaces a 50/50 mixture of Isopropyl Alcohol and water will clean the surface nicely (test on a small, inconspicuous area first). (PIC 2-3) Dry the surface with a lint-free cloth before application. For an optimal bond, the temperature of the surface should be between 65º and 100º F.