Cr0's idea will work and linvillegeorge explained what is happening. With as much manmade as I've been riding this year, I find my edges dry at the end of the day and I wax every single day on my Westmark. It's really not a problem, the middle the base still has enough speed to carry across flat spots and get speed for hitting stuff which is the only reason I'm such a wax so much.
So you can either use a harder wax on the edges/areas that dry fast or you could carry a couple of boards, all freshly waxed. Otherwise, it's not going to hurt anything.