What about for really sweaty drummers?
To what mic are you referring, or do you have a thing for perspiring drummers?
I've worked with plenty of singing drummers over the last 20 years, all of whom sweat rather profusely. The mic of choice remains to be the Crown CM311a. Tried AKG... only works with the lightest-of-touch drummers. The Countryman and similar mics might as well be overhead mics. No workie...
While I understand that no mic will work if it doesn't stay in place, neither will a mic work if it stays in place but picks up more kit than singing.