RE: Solartex
Solartex is great stuff. It shrinks better than the plastics and can be applied wrinkle-free with a minimum of effort. Some claim it is necessary to coat it with a clear coat to protect it from fuel/dirt. I don't agree...just clean up after each day's flights. Handles sun well and, if it does sag, can be easily reshrunk with either an iron or a heat gun.
Some of the lighter colors are not very opaque. Keep in mind it has a very fabric-like look which may not be appropriate for your particular application unless you intend to paint over it to obtain a glossy finish. Can be cut into graphics and applied over itself without bubbles.
Yes, it's pricey. But for the right airplane it's more than worth it.