In previous conversations, Brian told me he prefers to spread RRL fluids with CF brushes, the same kind you dry brush with, using one for DC and one for VW.
I've tried those, the Last brushes, painting pads from Walmart and DD brushes. DD brushes work best and CF brushes are a close second. The CF brushes will occasionally shed a fiber. If your RCM doesn't pull the fiber out of a groove, your stylus will. Still, if I didn't have DD brushes I'd use CF. Those zillions of tiny fibers do a great job of getting the RRL fluids down into the grooves.
I've tried those, the Last brushes, painting pads from Walmart and DD brushes. DD brushes work best and CF brushes are a close second. The CF brushes will occasionally shed a fiber. If your RCM doesn't pull the fiber out of a groove, your stylus will. Still, if I didn't have DD brushes I'd use CF. Those zillions of tiny fibers do a great job of getting the RRL fluids down into the grooves.