Poor contact with photopositive. When coating SBX on glass, background surface must be non-reflective. Work under yellow or safe light from exposure until after wash out. SBX was previously exposed to UV light. Wash out with a consistent pressurized spray of water in a vertical position.
Image delaminates or comes off the substrate during washout.
Perform an exposure test to determine the proper exposure time. Check to see that black areas are opaque enough to block out light and clear areas are transparent enough for light to pass through. Improper wash out. Wash out with a consistent pressurized spray of water in a vertical position. Wash only until image is open.