Spray
This technique involves the use of a spray gun for the simultaneous deposition of chopped glass and catalysed resin onto the surface of a mould.
A chopper unit attached to the spray gun chops glass rovings into specified lengths (usually between 20mm and 50mm), and the chopped strands are then directed towards a stream of catalysed resin and it exits the spray gun.
Resins, such as those in the Crystic range, which are designed for spray application are generally low in viscosity, so they rapidly wet out the chopped strands. This ensures they are more easily atomised into the desired spray pattern.
The rapid wet-out achieved by spray deposition allows faster and easier consolidation than would be achieved with hand- lay methods, but thorough rolling of the laminate is still necessary to ensure complete air removal.