There is no reason for you not to be able to use silk on graphite, as for the transparent finish you want you must make sure that the wrap is tight - by this I mean that there are no gaps between threads and not to over tension the wrap - burnish the wrap and apply 50/50 varnish - Goldenwitch sells a product for transparent wraps - you then bulid up the finish with multiple coats of urethane or epoxy - your choice - I never seen a graphite with clear wraps but it sounds awesome and I might give it a try.