Contrary experience
Mike Schwing from Md.
>I almost never run the buffs at high speed. The exception for that is when buffing Watco'd salad bowls, where the high speed treatment seems to produce stellar results.
But my experience with lacquers, varnishes, sealers, etc... has shown me that the slowest speed you can reasonably stand working with is not only safe, but it removes less of the finish that you're trying to put a shine on. There is less tendancy to lose grip of the work, too.
If trying to produce a glossy finish with lacquer, a high speed will be way easier to melt/burn the lacquer right off and really piss you off, than with the slow speed setting.
However, you didn't indicate what you were trying to buff, but rather asked about keeping the wheels charged. I would say that the only wheel that really keeps any charge to it is the carnuba wheel, for me anyway. I reapply, by just a quick touch of the stick to wheel, about every fifth of a work's interior and exterior surface.
Sometimes I have to read the writing on the wheels to determine which is which because they look too clean to discern by appearance alone.