Sly: I paint the VanDyke direct on an uncoated cloth, so NOT on coated cloth. I had bad results with that and good results on wood. Important: use a solid not soaking surface underground as an underlayment for brushing. After painting one side the other side is allready wet enought. Hang it to dry in the dark and then the standard VanDyke process: http://www.sciencecompany.com/Van-Dyke-Brown-Photographic-Process-W165.aspx My exposuretime is 4 minutes UV at 9 cm distance.