This is one of the most problems that users run into. When placing their product into the base of their bathtub, they notice that many of the suction cups will not stay put, and a mat that isn’t properly affixed can be dangerous. To ensure that your unit is secure, it is imperative that the surface that you are working with is both clean and dry. The base of your tub might have a layer of invisible soap scum that is going to interfere with the suction cups. Some users find that when the surface is warm they have a better chance of getting it to stick. To achieve this, after you clean the base, fill the tub with a thin layer of piping hot water, and let it sit for a few minutes. Then, drain the tub, wipe it down, and affix your design to the surface.