Hand Lay Up is an open moulded process where chopped strand matt is wet out with resin.
Gel coat is usually brushed onto the mould and critical areas or joins are brushed in again to prevent thin gel.
The operator will layer in the required amount of CSM and wet out with resin, the unit will then be consolidated with a paddle roller
Hand lay-up is the simplest process for manufacturing composite products and is normally used on small production runs or more complicated smaller components.
Tooling is a low investment as only one side has a finished surface, which is usually gel coated, the rougher rear glass finish is normally not seen.
Complex mouldings can be created by using multi-part tooling and it is a great way to prototype parts that can be later converted to RTM/Vac Bagging.