OK, so I've been wondering how long my steps will last me over the winter and a thought came up. I should eventually figure it out myself, but what is the relation between sealant and wax as far as durability? What I mean is that does layering one product on top of another have any affect on the previous product? For example, I'm layering two coats of 845 on top of two coats of EX-P. Consensus seems to be that the 845 has longer durability than the EX-P. So once the 845 has run it's course, does that mean the EX-P will also be done for? Or will the extra protection of the 845 allow the EX-P to last a while longer once the 845 has come off? So say the 845 lasts three months, and the EX-P lasts two, will the EX-P last another two months after the 845 is gone, or somewhere inbetween?