It is helpful to stagger the strokes of each coat so the overlap at start and stop and top and bottom is not always in the same area. Follows application direction. Varied streaks and fluorescing of coating throughout stroke pattern. It should glide along surface and not drag. Rinse applicator in water periodically during use.
Surface is too hot.
This is making the Vertglas dry on the surface too quickly. Rinse applicator in water. Squeeze out excess and blot with a clean dry cloth or set out to dry. See NEXT YEAR section of this guide. Try applying more coats than you did last time, this should extend the coating life.