When we need to underbase plastisol we use discharge. Much easier and cheaper. Less flashing as well.
I think my goal for this year has to be to learn this. My understanding is you underbase (using discharge) with screen 1. Then screen two will print the top color, etc. The print won't look bright until you put it through the dryer. At that point the underbase will discharge, leaving the top colors nice and bright as if printed on a light/cream color tee?
How much time does this need to be in the dryer for and what brand discharge are you using? I don't have a very long dryer and do not have forced/scrub air. I'm not sure if my dryer will be efficient for this.