Toupret Interior is an all purpose filler and will fill cracks and holes up to 5mm deep. Interior filler comes in 10 x 1kg bags and is easy to sand down and can be used to fill plaster, plasterboard, primed wood, cement, brick, masonry, stone and cellular concrete. Drying time: As a Surface Filler 1 hour, Holes and Cracks up to 5mm 3 hours. Mixing; 0.5L of water for 1kg of powder. Working time: 30-40 mins.