SP201 Acrylic Polymer Casting Plaster Strengthener and Waterproofer
Create stunning effects and significantly stronger casts by using SP201 Acrylic Polymer within the mix prior to casting. This product also makes casts water resistant excellent for casts that are for outdoor use.
When used in conjunction with our liquid dye products SP201 can produce excellent colour composites and having the base colour right through the cast has obvious advantages in that the item can be carved and any slight damage will be less noticeable.
As an example, the following recipe produces a hard, polishable jet black plaster similar in touch and feel to marble.
10ml of black pigment
25ml of SP201 acrylic polymer
50ml of water
500g of an a plaster (An alpha plaster – typically Crystacal R or Crystacast)
Product is supplied in either a 250ml or 1 litre bottle in concentrate form. The product needs to be diluted, typically 1 part polymer to 3 parts water as a strengthener, and 1 part polymer to 5 parts water to give casts a water resistance. How much you require depends on use but as a rough guide a 250ml bottle would treat between 2 and 4kg of plaster. *Note when using the polymer less water is required as it lowers the surface tension enabling a denser cast. It is possible when striving for that perfect cast (such as when making chess pieces) to double treble or even the quadruple the quanities used.
SP201 is a fine particle size, styrene/acrylic ester copolymer dispersion. As supplied it is ammonia free enabling its use in enclosed environments.