Originally Posted by rugjenkins
Clean, dry and apply
Not if you want it to stay put and do it's intended job. Surface prep is key, just like painting a car.
Clean and dry to start, then use either mineral sprits or my fav….carb cleaner but NO ALCOHOL for polyurethane or silane terminated polymer based sealants.
Apply between masking tape if you want a neat job and remove the tape immediately. Clean up with mineral spirits. Practice before starting, as when properly applied, it is NOT easily removable!!