Opportunity is missed by most people because it is dressed in overalls and looks like work. - Thomas Edison
Yes everyone, Pure Photopolymers remain sensitive to post exposure. Even when it is part of a dual cure, or adding diazo, the SBQ sensitizers can still be exposed further.For diazo emulsions, once the diazo is exposed to water it loses most of its' exposure capability. Post exposing in thesun only helps dry out the emulsion film, which is a good idea with discharge.Some good reasons to post expose:Pure Photopolymer is easier to reclaim. If you underexpose SBQ emulsion and use Screen Opener it will flash any unexposed sensitizer and make reclaiming difficult.Dry screens are better for water base and discharge. It is possible to overdry in really cold dry conditions. 30-35% is an optimum humidity to dry in.By aiming the squeegee side toward the sun or lamp you expose the side that had weak light during the exposure process. This is the side that needs strength for Discharge.Post exposure however is a band aid on the exposure process. Well dried screens, good light source, proper time are at least 85-95% of the strength of the emulsion during print. Hardeners and Post exposure help, but should not be a substitute for proper intial exposure.