Resealing Roof Joints and Penetrations

I am hoping either rvroof.com or Rhino Linings gets a spray booth affiliate in my neck of the woods. A polyurethane epoxy elastomeric coating (big words for stuff that will stay flexible and stretch as the RV bounces down the road and as weather changes) sprayed on from a two part mix would be the ideal solution, as it would only need to be applied once, then perhaps reapplied as one replaces things on the roof, or if there are punctures (say by tree branches.) Since it dries to effectively one piece, no Dicor or Eternabond is ever needed, and since it is painted a bit down from the top, water won't be going in any roof seams.