The website for Envirotex Lite is: http://www.eti-usa.com/
Their on-line response was that you can find it at craft stores and
hardware/paint stores. I found it at Pearl, an art/craft supply
store in Los Angeles. (Although when I searched on-line at Pearl it
didn’t come up.) The same company makes Crystal Sheen and Ultra-glo.
Apparently they’re all pretty similar in function.