When spraying all interior trim which includes floor trim, doors, door casings, and window seals. you always wanna lay your blue 2 inch tape down on all the floor trim to be sprayed. 2 inch blue tape is also good for taping of all your hardware on door hardwear and arears like around bath tubs and other permanent fixtures that around areas to be spray painted. after completing this you would at least need to let it dry for 3 hours before you can start taping of the trim in preparation for the walls to be painted.