I agree with Lew about the number of variables. I used to make the resin way back in the 1950's! and went on to play with silly things like grinding rubber- and measuring it!
My best advice is to go to a place where grinding wheels are supplied to the trade- none of these awful Chinese efforts which were probably from the Great Wall

What are needed is at least two wheels- say to replace these Chinese affairs that come on the cheap 6" double ended grinders. They push out perhaps around 3000rpm or the English variety does. For ordinary grinding of hss and carbon tools, white Aloxite of a softish grade is common.
Probably 60 grit for roughing out and 80 grit for 'a better finish. My Clarkson book quotes several grades but one is 38A60K5VBE which is a 60 grit wheel and which does not burn the work. Here opinions differ but I usually hone after the grinding. Others might settle for perhaps 100grit
However, you might consider adding a diamond or CBN wheel to your arsenal. The first means that you can touch up carbide tooling.
There are plenty of books. I have the Clarkson one but also have the Quorn one.
Trying to conclude, experiment with the suggested two wheels.
By all means, go to Gadgetbuilder.com on the net. There is sound reading and advice.
Norman