Originally Posted by Don ravinerat
Boy nice job. Now I don't know if I should polish or Zep next spring.
They do two different things. Polish rubs off the surface material thus removing gel coat that has oxidized (chalky) and removes enough material to smooth out the pitting and leave a smooth polished surface.
Zep you clean off the oxidation first and then Zep wax coats the surface filling in the pitting of the surface and give a smooth shiny surface. While providing a protective seal.
Every time you polish you are making the surface coating thinner. Polishing compound is an abrasive. A very fine abrasive but still very much like sanding it down to a smooth surface. You don't want to do this too often or you will wear right through the colored gel coat. If you polish you need to wax afterwards in order to protect the surface. You can use many different protective waxes.
Zep is a wax so when you use that it sort of does both steps in one shot, but without actually smoothing the underlying gel coat. Just filling in the pitting that takes place over time to provide the smooth surface. You can do this as often as you wish since it removes no surface material.
is old enough that I would be reluctant to polish because the gel coat might be pitted enough that a lot of surface would have to be polished off to get to smooth and shiny. For me Zep works better, newer trailer a light
polishing and regular paste wax a couple of times a year might be a good choice.