As alternatives to Barrowlass's approach (tho very similar), some methods I've found sometimes work..
Set the root specular "sockect" colour to white (you can tone it down later if necessary)
Then plug the noise node into int the specular's Value socket.
Also, try using the "Granite" node instead of the noise node - gives you more variation...

There's a lot more can be done (combining the above with a grey-scale bit-map to control where the sweaty bits actually appear springs to mind; the bit-map would have to be based on V3's texture template as far as shape is concerned for that to work). You could plug the bit-map into the specular value and the noise/granite into the colour....

Just a few "off-the-top-of-my-head" suggestions...

Hope you get the effect you want!!

And (please?), if you do, post the result and the method you used here in the forum?

'Cos I'm still learning this stuff too..

Cheers,
Diolma