Polycell Deep Hole Polyfilla is a two part plaster based filler that fills deep holes up to 50mm and dries to a structurally sound repair in just 20 minutes. Application Description Remove inner Part B from the main Part A container. Mix equal amounts of Parts A and B on a flat surface into a smooth even coloured paste. Do not prepare more than can be applied in 5-10 minutes, as this is the working life of the product. Press the filler into the repair with a filling tool and finish off by smoothing with a wet tool and leave to set. Sand down when fully dry and overpaint when used outside.Structural repair - drillable and accepts screws and nails Fills holes up to 50mm deep in one application No shrinking,cracking or saggingCan be overpainted in 30 minutesPlaster based - smooth and easy to sandDrying Time 20mins. Polycell Deep Hole Polyfilla is a ready mixed formula for filling holes up to 50mm deep in one application. Quick and easy to use, this filler is ready to paint in just 30 minutes. A two part plaster based filler that fills deep holes up to 50mm and dries to a structurally sound repair in just 20 minutes. Fills holes up to 50mm deep in one application No shrinking, cracking or sagging Can be over painted in around 30 minutes Plaster based - smooth and easy to sand