The spraying quality of FRP resin gelcoat directly affects the appearance quality, weather resistance, water resistance and chemical medium corrosion resistance of the product, so it is necessary to strictly control the coating of the gelcoat. Notes are as follows:

1. When configuring FRP resin gel coat, it should be fully mixed, especially when using different pigment pastes, if the mixing and distribution are not uniform, some spots and streaks will appear on the surface of the product, which not only affects the appearance of the product but also reduces its physical properties; adding The curing agent should be stirred evenly to avoid surface wrinkles, cracks and other defects caused by uneven curing.

2. Use a brush or a special spray gun to spray glue. If the viscosity of the gel coat is too high, an appropriate amount of styrene can be added to adjust the viscosity and make up for the styrene lost by volatilization during the operation, but the amount of styrene added should be controlled according to the process requirements.

3. The thickness of the FRP resin gel coat layer is controlled between 0.3~0.5mm, and should not be too thick or too thin. Generally, the amount of gel coat per unit area is controlled, that is, the thickness of the gel coat amount is 350~500g/m2.

4. The gel coat should be sprayed evenly, and try to avoid local accumulation of the gel coat.

5. Control the curing degree of the gel coat layer and accurately determine the pasting time of the reinforcement layer.