Rex,
You can go to all that trouble to get several different 'fly tying' products, and apply them to your fly heads.
Or, you can go to the hardware store and buy a can of lacquer.
Plain old clear gloss lacquer. A quart runs between 10 and 12 bucks. You'll also need a can of lacquer thinner.
Thin it down up to 50% for a fast penetrating head cement. Use 'as is' for a thicker coating.
To get a nice glossy head, all you need to do is apply several coats. Use a bodkin to apply to small heads, a small artist's brush for the larger ones.
The thin stuff dries fast (like right now, if you say 'is it dry?', it's dry). If I want a high gloss head, I'll tie a dozen or so flies, applying a drop of the thinned down 'head cement' as each is finished. After all the flies are done, I'll go back and apply a second coat of unthinned lacquer. After that application, I'll go back to the first fly and apply the third coat (yes, it will be dry by then). If you build reasonably smooth thread heads, three coats is all you need. If you get sloppy like do at times, then a fourth coat fixes it. If I'm going to paint on eyes, I do that on top of the third coat, then finish with a fourth coat of the clear.
If I want a black head, I use black thread, etc.
If you want 'colored' lacquer Jann's Netcraft sells it. either separately, or in a kit of several colors, in their lure making section. A 2 ounce bottle will make thousands of eyes or colored heads. It's not expensive. Sometimes you can find colored lacquer at a paint store....then it's 'cheap'.
If you want a 'one step' high gloss head, then go to epoxy. DevCon 2-ton makes a clear, hard, glossy head in one application. It's non reactive, so you can put it over any other finish.
Good Luck!
Buddy
It Just Doesn't Matter....