Q: What kind of surfaces will the foam blocks stick to?

A: The adhesive block backing has 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.

About the only thing we tested that would not stick to the blocks was minion #276368.