...does the spray crack when you roll up your print to ship?
No. I usually apply four layers and the papers I use (Canson Platine Fibre Rag and Hahnemühle Photo Rag 308) actually become more flexible.
As with any spray, you should experiment with distance and constant speed at which you move across the image. Hahnemühle recommends that the print lie horizontal, but vertical is better for me because it is less apt to pick up whatever gradoo might be floating in the air while it dries. However, vertical means extra care to not hesitate in movement or you'll increase the possibility of a drip. In any position, keep the spray going continuously and use the area outside of the image for changing direction.
