This is vaguely related.
I'm a 10+ year screen printer but I've only done apparel printing. Our inks and 35' conveyor dryer are very impacted by weather/humidity. Luckily our tshirts don't cost as much as a nice used car.
I don't know shit about clear coats.
What really frustrates me is my MMR playfield looks like glass and my MBR playfield looks like the surface of the moon. Both bought NIB but the MMR was bought late run and the MBR was bought early run.