It might mean 'casts'.

casting
Main article: casting
Casting is a method of producing one or more copies of a sculpture. Typically, the original sculpture is modelled as usual and covered with a moulding material which sets hard when dry. The mould is then separated to release the original sculpture. Once the mould is reassembled, at its most simple the casting material is poured into the void and left to set. Traditionally, molten bronze is used as the casting material, but modern alternatives include resin. When the cast sculpture has cooled, or cured, the mould is again separated to release it, and reassembled ready to cast the next copy. When molten bronze is used, it is more typical to use a lost wax or similar process so that the finished piece is hollow rather than solid.
The cast sculpture may then require some finishing work to remove mould lines and other imperfections. The sculptor may also wish to patinate the work to produce the final piece....

http://en.wikipedia.org/wiki/

Tacelado del molde o poder abrir el mismo durante la fase de gelificación para evitar y aliviar tensiones sobre la pieza terminada.

http://www.distraltec.com.ar/acrystal/faqs.php

Acrystal Prima acrylic resin

two component water-based acrylic resin system for casting, laminating and coating...

http://www.modulor.de/shop/oxid.php/sid/x/shp/oxbaseshop/cl/...

El tacelado con yeso.

En esta etapa, arme una caja para poder contener el yeso al momento del tacelado, lo que cruza sobre el modelado son placas radiográficas, estas sirven para dividir el tacel en varias partes dependiendo de la escultura, en este caso no era necesario que le haya puesto las placas pero se las puse igual para sacar mas rapido la arcilla y me sea mas fácil desmoldar.

http://www.taringa.net/posts/arte/15215260/Mi-primera-gran-e...