Rustoleum followed someone else into the market. I think it all derives from Nano Clear
Nanovere Technologies, LLC. Industrial Coatings | Industrial Paints And Coatings | Nanovere Technologies
They claim a 10 year service life. The trick must be encumbered by patents.
The little nano-scale glass lozenges are supposed to adhere through van der Waals forces once the carrier evaporates.