I bought some of the metallic red for brush painting A/N braided line fittings. I tried it through the airbrush and found out it's some of the nicest acrylic I ever sprayed. It goes on very nice. The pigment is in scale, Good stuff.
I use to use dullcote and their semigloss but I always airbrush it. This gives you much more control. You control the shine with the way you spray. They spray well but both rub off if handled too much. I think Tamiya's Flat(TS-80) and Semi-Gloss(TS-79) spray better out of the can and are much more durable.
Try soaking in water overnight. water will eventually soften and weaken it. Do not use suprglue for windows, you are asking for trouble. Try a good PVA glue like Formula 560 Canopy Glue or Microscale Krystal Klear. It can be rubbed right off or wiped off with water on a Q-Tip. It does take awhile to setup but the safety factor is worth it. It holds very well when dry.