I've made lots of silicone seam sealer from GE Silicon II and two parts paint thinner. It cures invisible on sil-nylon. I suppose you could get some oil based colorant from the Home Depot paint mixing gal and make silicone paint.
I made some from black silicone to UV proof trampoline bed stitches.....that stuff is some nasty goo, but it outlasted the fabric itself. It comes in brown, black, white, and clear. Maybe carry some camo netting from the army/navy store.... <img src="/forums/images/graemlins/cool.gif" alt="" />
If you are using the tent to stealth camp, pitch it after sundown and don't worry about it. Human eyeballs don't see color well after dark. <img src="/forums/images/graemlins/grin.gif" alt="" />