Don't know about the pricing for ceracoat, I do my own with Duracoat. If I'm wrong I'm sure somebody will correct me on the blasting, but I believe that blasting with grit leaves the pores in the steel open, while the small glass beads do not. If the pores are open, oil or any coating will penetrate better. I believe it also leaves a rougher (on a microscopic level) finish that a coating can adhere to better.