Polycell Deep gap filler 1L. This deep gap filler from Polycell comes ready to use & is perfect for filling & repairing joints cracks & holes on internal surfaces of your home. Simply apply with a filling knife to walls & leave for 4 hours to dry. It's non-shrinking or sagging to ensure it has a longer life. It can be painted over once it's dried ideal for colour matching with your existing decor.