I am new to the industry and am having problems with Aqausol. My first screen came out perfect, but since then, I can't seem to get the Aquasol emulsion to wash out. My cure time has been 2 hours and exposure around 3:15 to 4. Neither has washed out. Am I curing too long? Should I expose less? I'm using a 500 watt Halogen at 12 inches mounted abouve with 1/4 inch glass. Both light and glasss have no UV protection.