Originally Posted by khatfull

I would assume that might depend on your environment but I have parts have have been polished for over a year and are still shiny. Time will tell I suppose. I don't have an enviromental chamber .

Mother's doesn't mention any kind of protective coating but Blue Magic does which is one reason I end with it. Whther that's true or not I don't know.

What I do know is this. Once a part has been brought to this condition even if it does oxidize a bit it could be made shiny again in very short order with a quick polish. The time investment is in the flaw removal and all the smoothing. Once polished REpolishing is easy.