I finially got a chance to ask Judith at New life resources about what they use on their canvas. I have had New lifes canvas on my truck for 4 years now. Even the strongest down pour the canvas still does not even get moist inside. Since my new duece needs treatment real bad and the M715 probably could use another treatment I called to ask. She said it is a product called Canvak. It can be found at Cabelas. 17.95 a gallon. She stated the importance of keeping the canvas fibers coated well and suggested two coats on the roof since it sees the brunt of the weather. I'll attempt a link to cabelas site.
http://www.cabelas.com/cabelas/en/te...rch&hasJS=true

I hope the link works since it's such a long one... If it does not work, pull up cabelas site and type in "canvak" in their search window. The label is funny.