Plaster Retarder is a strong retarder used to control and slow the setting time of your casting plaster. This enables you can mix larger batches, cast larger moulds and volumes and gives you more working time when required.
Plaster Retarder is a safe-to-use granular material which needs to be dissolved in water and used as a concentrate that is added to the gauging water before mixing in the plaster powder. We recommend 110g of Retarder to 1ltr of hot water and being allowed to cool before use, this concentrate should then be used to add to your gauging water.
Being a very strong concentrate only small amounts are needed. We strongly recommended a small test is carried out to ascertain and calculate the needed reactions.
Please note; this Plaster Retarder is designed for use with Casting Plasters, such as Fine Casting Plaster and Prestia Casting Plaster. We have not tested it with building or wall plasters.