Gelcoat is thicker than paint, so it requires a spray tip with a larger orifice. The recommended nozzle size for spraying gelcoat depends on the type of spray gun you are using. Check the spray gun manufacturer's info to make sure your gun supports the nozzle size you want to use.
For best results spraying gelcoat, we recommend a spray gun designed specifically for applying gelcoat, such as the ES G100 Gelcoat Spray Gun.