Suction Cup Shower Shelf Use Environment
Where does it stick best?
Suction cups adhere best to smooth, non-porous surfaces such as tile, glass, fiberglass, or metal.
But if there is too much air flowing on the surface that elasticity can not cover, suction wont work.
To ensure a firm bond, surfaces should be free of dirt before attaching the suction cup.
The wet surface does not matter.