Gorilla Filler Decorators Flexible Ready Mixed Wood Cracks Remover 320ml The gorilla filler is suitable for domestic plastering and DIY. The filler expands on contact to fill any shaped gap and hardens to form an airtight weatherproof seal. Wear protective gloves when using. Shake the can thoroughly. Screw the nozzle to the outlet on the top of the can. Turn the can upside down and point the nozzle at the hole to be filled and press the trigger.