I guess this stuff is "prepreg" carbon fiber composite, probably baked in an oven I suppose after it's layed up. Anyway I lit into a piece today with a new 3 flt aluminum cutting style 1/2" endmill. It cut great, left a smooth nice finish, but created heat and yes did dull very quickly. I cut it dry. You guys keep mentioning diamond tooling, what do you mean? Diamond coated carbide? Diamond incrusted? What manufacturers, flute style, whatever? I used some endmills today that had little diamond bits incrusted to them and it did not leave a nice finish, rather course and porous compared to the fluted endmill. The parts I will be cutting will need about 1.5 flute length to cut the profile then have the top side contour hemstitched. It looks like maybe there won't be any hole drilling after all, so I mainly need advice on endmills. Thanks, Mike.