The first impression of Viel S-5-M

[Mark Reich]

PDP is the most aggressive compound on the market, and at high speed it will keep creating burr, as noted by Mr. Grepper.

CBN is better at removing burr, and plain boron carbide is even better.

It's a similar story in reverse. Boron carbide leaves the slickest edge, and PDP produces the most aggressive edge.

The only way to really take control is with variable, or at least, low speed.