Fast Fill is a multi-purpose ready-mixed filler. Fast Fill can be used on a wide range of substrates. It is ideal for filling gaps and cracks on floors, walls, ceilings, wood and fiberboard. Fast Fill finishes to an easily sand-able surface, is algae and fungi resistant and can be over painted with acrylic and enamel paints. Available in 5L, 1L & 500ml pack sizes.