Hand lay-up is the most elementary way of making a composite part. After applying the gelcoat layer, the fibers and the resin are brought in and vented manually.
Infusion technique by using a foil with vacuum. The evacuation of the air does compacting the fabrics/reinforcing materials, which leads to maximum mechanical properties of the produced part.
RTM is a similar technique to the RTM light. The difference is that we work with solid heated lower and upper mold often milled (but it can also be constructed in epoxy composite material).