Opportunity is missed by most people because it is dressed in overalls and looks like work. - Thomas Edison
Dont some tack cloths have some sort of oil in them?Since I have not had any formal training could anyone see this? I coated about 12 screens yesterday and a few of them had these lighter circles on them. I clean the same way each time but these had them, admittiley my washout booth is filthy but I give each screen a generous flood rinse before setting to the side to dry.