Just want to be sure before I purchase:
Is Envirotex Lite compatible with foam insulation scenery?
Can it be tinted with acryllics such as Pollyscale?
Yes and yes.
Use a very small amount of paint to tint the Envirotex, unless you want an opaque pond or stream. I use cheap acrylic craft paints. The best effects are generally achieved by painting the base with darker colors at increasing depths. I do the same with my tinting - the first layer of Envirotex has a bit of blue or black, the next a lighter green, and upwards to a clear layer at the top.
It takes an iron man to play with a toy iron horse.
Pour it in thin layers that would just cover the area to a depth of maybe 1/4 to 3/8 inch. You might be able to get away with more, but the thicker it is, the more you risk it not curing properly.
The above is my opinion, from an active and experienced Model Railroader in N scale and HO since 1961.
(Modeling Freelance, Eastern US, HO scale, in 1962, with NCE DCC for locomotive control and a stand alone LocoNet for block detection and signals.) http://waynes-trains.com/ at home, and N scale at the Club.
When pouring Envirotex check for leaks before leaving the room. Don't ask me how I know this but Envirotex fill flow to the lowest portion and will ooze through any small opening.
Modeling HO Freelance Logging Railroad.
Heed well the words of Elmer and Wayne. Ignore them at your peril.
Since I apparently know more about economics than certain geniuses in Washington, I'll offer up the following tip: Michaels and A.C. Moore, the big chain craft stores, have coupons on line all the time. Generally, there is a coupon for 40 or 50 percent off one individual item. Hardly worth printing for a 25 cent strip of balsa wood, but when you're looking at even the small size of Envirotex Lite, it's real money. They take each other's coupons, too. While you're there, they have craft paint, balsa wood strips, paint and foam brushes, plaster cloth, and kits for making satin pillows with pink ponies on them. Not all of these products are necessarily applicable to model railroading, but I shop there as often as I go to my LHS.