Most use .2 oz CF vail (mat) and apply it with clear dope, so they should not be expecting any strength from it. If you wanted strength, you'd surely use .5 oz CF vail and apply it with epoxy.
I have yet to use either, but I have used .6 oz FG/epoxy on F1A glider C-tube wings. SOP among the FAI FF guys is to put it on at a 45 deg. bias, for maximum strength and particularly torsional strength. Two thin coats of clear nitrate precede the glass/epoxy. Lay the glass on the lightly sanded surface and apply epoxy. Z-Poxy finishing resin would be perfect. Brush it on, get the stuff down smooth, and roll off the excess with a roll of TP. As the TP absorbs the excess, tear it off and dispose of it. You are looking for a uniform, matte finish with no glossy areas. It works very well on FG, dunno about CF vail, but I'd sure try it.
Some F1C guys would aggressively sand this until it was smooth, which cuts the strands in the weave, and reduces the strength radically. It does provide a very hard surface and pretty stiff, if not strong. I gave it a few coats of clear nitrate, sanded it lightly, and covered with tissue and more clear nitrate. Weight and visibility were a lot more important than smooth or shine, since we hoped to be viewing our planes from at least 200' and sometimes 3,000'.
The glider shown was one of three identical, built as a batch, in 6 weeks while working full time, from blank paper. That included designing and fabricating the three towhooks with a new timer start system. The wing is built much like a stunter, is roughly 5/16" thick, with 1/32" sheeting and cap strips over 1/16" ribs. Spruce spars. I found out these wings were plenty strong, but too brittle.
Steve