>>7519053Mr. Color varnishes are the best. I use GX 100 and I'll never use any other gloss varnish ever again. They also make a varnish that prevents yellowing, though I've never had any issues with my GX100 yellowing anyways.
As for matte varnishes, I have several varieties of matte, semi matte and flat Alclad varnishes that I've been using for years and they all work excellent. You could probably get some silicon pigment and just add it to GX100 in varying amounts to create a varnish with that as well though.