All too often I see painters wrapping roller covers in masking tape to remove loose nap fibers. I’ve made it a point to investigate this crazy idea over the years, and I can tell you--all that does is loosen more nap fibers because the craziest thing happens when you keep re-wrapping a cover in tape… it keeps pulling fibers. Besides, a roller cover should be soaked in water and spun before each use. If you want to take it a step further, shop-vac the damp cover too. Pre-wetting a roller cover allows for fast initial paint pick-up so you don't need to roll paint on half the wall before you start to feel the cover getting loaded with paint and pre-wetting helps with cleanup too.