Flashing between colors

Flash only until the ink is dry to the touch (gelled), not to full cure. Sources give different example numbers:

Screen Printing Magazine warns that over-cooking a flash (past roughly 230–260°F) can cause poor adhesion of the next layer. These ranges overlap, so flash at the lowest heat that gets the ink dry to the touch; your ink’s TDS decides. Going hotter or longer risks that poor adhesion. Over-flashing can also scorch, shrink some fabrics and push dye migration. If a flashed print feels tacky, let it cool for a few seconds and touch it again: ink feels tacky while it’s hot. Still tacky once cool? It’s usually under-flashed, so add a little flash time. Suspect over-flashing only if the print looks glossy, the shirt shrinks, or it smokes. Time the flash with a stopwatch, warm the platens with a few test prints, and let the print cool briefly before the next screen.