Originally Posted By: qwertydude
I don't know which people report better longevity but it's been my experience that 915 is at best the equal to 476S in longevity but only under the best scenarios. I usually saw a couple months before the beading was compromised during hot weather, not completely gone but you can tell certain areas like the hood and roof wouldn't bead quite as well, especially on darker cars. On the east coast though you'd get through pretty much the entire winter.
I will say 915 falls at least a few weeks shorter in terms of durability to 476S. The reason I use it is easier application and removal and better looks. I usually wax once a month so the slightly shorter durability isn't a concern for me and I like better looks and easier application and removal.
As for by machine liquid is still easier. Paste can be easy, it's just that you need a card to scrape wax out of the tin unless you can tip the wax block out. But paste generally will outlast liquid if applied properly, paste needs to be worked in, ideally by machine, whereas liquid you can just spread it and let dry.
No argument from me over the longevity of 915. I've never used the stuff. Collinite doesn't promote it as being more durable. It being a Collinite produt, though, I expect it would still be better than average on the durability department. I know that you have not had good luck with Collinite dirability, but your experiences seem to be the outlier.
As to paste vs. liquid on a machine, I use a putty knife to get at the stuff. My objection to using liquid with a machine is that it seems quite wasteful for the product to use liquid that way. I suspect that as you say, paste tends to be more durable, so put that hp to work!