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I'll have to try that, since I have multiple dedicated wheels for each grit (multiple sizes of multiple types).

I don't think I'll be trying this, but for anyone who might be interested, are you talking about greaseless compounds, or polishes, or both?

My only assumption is that he is only going to use the flex shaft--like a dremel. Hopefully he does not intend to use the grinder wheels.

If it feels hot to the touch, then that's too hot. The thinness of the steel means that it takes very little friction to overheat it.

Edit: Actually, I should correct that. If it feels hot to...

On a small scale, yes. However, it can be more dangerous and more likely to overheat a blade.

Take greater note of what Undream pointed out. A wheel with some compound on it helps in accumulating more on it. Try to apply some compound and when you get frustrated, walk away for a few...

AND,
please, wear a respirator. That stuff does not belong in your lungs. I have not been able to use my buffer for the past several months only because I no longer have a way to properly clean...