I use Fletch-Lac quite often on bare black carbon shafts (Gold Tips). The secret to fantastic adhesion is to properly prep. I lightly go over the entire area to be dipped with some fine steel wool. Then I put them in Bohning SSR solution for 7 minutes, followed by a hot water rinse (don't touch the shaft area that you are going to crest with anything but the water at this point). Let them air dry. Then I dip in Fletchlac that has been thinned properly (directions / opinions on this subject vary - but my best results are with Fletch-Lac that goes from "solid stream" to "slow drip" in about 30 seconds.). In that 30 seconds, I am rotating the shaft between my thumb and index finger, looking closely for any tiny bubbles, and popping any that I may find with the tip of a straight razor blade held in my other hand. I do this quickly and lightly. Then I hang to dry for 24 hours. The next day, I dip again - no prep necessary - just don't touch the first dip at all. Dry for 24 hours. Then I will crest with Bohning lacquer and fletch using either Fletch-Tite Platinum for vanes, or Fletch-Tape. No matter what - I use Bohning with Bohning, and get fantastic results every time. I use dip, cresting paint, glue, tape, and even the thinner - all Bohning, and I never have a problem, and the results always come out perfect.
I've tried various products, and they don't work as well. A friend has noted that thinning Bohning dip with Acetone makes a Dull finish instead of bright. Duco doesn't stick well to it. Neither do other brands of cresting paint. So I stick with what works - all Bohning.
All the best,
Glenn