Polyplast coarse is a synthetic plaster cum filling compound designed for exterior as well as interior use. It can be applied directly over the substrate or in combination with Polyplast fine depending upon surface condition. Polyplast coarse is applicable to most fairface surfaces such as concrete, plasterboard walls and ceilings, brick or block work, chipboard etc.nterior. The product is based on Plasticized acrylic copolymer emulsion,chick grits & appropriate biocide to resist fungal & bacterial attack. Polyplast coarse provides good resistance under hot & humid condition & can cover fine hair line cracks & other surface imperfections to produce a smooth & leveled surface for over coat.. The product is used for surfaces which require heavy filling and leveling prior to fine filling with polyplast fine.