I first became aware of this product in 2005 while traveling in Oregon. A fellow in a RV park in Florence, OR was cleaning his coach with a product called "The Solution" He bought it at the store in the RV park. I bought a gallon and since that time, I've ordered it directly from the manufacturer in Palm Springs, CA.
When I purchase this product, I buy (4) one gallon jugs at a time.
This is some "GREAT" stuff and I now use it on all my cars, including my 1973 911S as well as my coach.
Their web site is http://www.super-seal.com and their phone number is 1-888-299-2136
ps. For those of you with RV's, I also use their holding tank chemical called PIRANHA. It too is absolutely great stuff.