879-2 and 879-10 in the release cloth are the same tough, finely woven nylon fabric (usually called the release layer). ...Used to separate the breathable bag and the vacuum bag from the laminate during the vacuum bagging operation.

The release layer of the release cloth is an additional layer of fabric material, which is laid on the outer surface of the composite material during manufacturing. It is intended to peel the layer at some future time before bonding. The release layer of the release cloth is woven fabric, glass, nylon or other synthetic materials. During the curing cycle of the composite manufacturing process, the release layer fabric will absorb some of the matrix resin and become the middle part of the laminate. When bonding is to be carried out, the release layer is removed to break the resin between it and a reinforcing layer. This leaves a fresh, clean, rough surface on the base resin and pastes the adhesive on it.

Before laying the release cloth, the large piece of release cloth can be appropriately cut small, which is beneficial to demolding. The release cloth should cover the entire reinforcement material, and the edge of the reinforcement material is generally about 1cm more. The overlap width between the mold release cloth and the mold release cloth is only 1 cm. Too wide wastes material and affects the infiltration speed. The release cloth is generally glued to the reinforcing material with a very small amount of black sealing tape instead of positioning glue, which will not affect the infiltration effect and save costs.