 Re: over burning screen; is there a such thing
You might want to get an emulsion calculator so you can target your precise exposure times. As everyone else has said, exposure times vary by emulsion type, light, how long it's been sitting and if any light has hit it before it was exposed.
I've been screen printing for a long time, used a ton of different emulsions and found that my diazo-core emulsion exposes best for 10 minutes on the dot. I then pre-wash the screen with a spray bottle of water and a damp cloth. I've found that lightly soaking and scrubbing the substrate (side that hits the shirt) side before I pressure wash it really helps get fine detail out.
Hope that helps!
Drew |