3D Speed w/Rotary

I don't see why not. I would take a look at some of the videos DIY detail has recently uploaded to youtube. Very low speed.
 
Can speed be used with a rotary?
Yes. 3d used to have videos out there using 505(bodyshop version of speed) with a rotary, marketing it for the bodyshop.

Sent from my SM-S901U using Tapatalk