Ground Coat
An opaque coating applied prior to a glaze coating or scumble when graining or producing special multi-colour effects. Also sometimes referred to as undercoat.
GRP
Glass reinforced polyester
Usage can include: Roofing, Cladding, Pipework, External doors, Boat building, Architectural mouldings etc. 
Gypsum
Gypsum rock is crushed into powder and mixed with water produces plaster paris.
The crushed powder is also used in the manufacture of plaster board wall boarding and plaster finishes.
