Hi Mike

You wrote:

The trick is to apply it to a surface that does not have a heavy load of another product already on it since that can compromise UB's ability to bond. This is especially true if you've used a synthetic polymer product on the surface previously. For example, Meguiar's Ultimate Quik Wax, which is a spray wax that won't stain plastic trim; if you've used UQW on your trim and then try to apply UB over it, the UB won't bond and it will wash away pretty quickly.

What can we use to prepare a surface that has a coating on it so the new product will work?

Thanks Joe