Hi, I am using the gelcoat gun for the first time. I am trying it with a white low viscosity polyester gelcoat designed for spraying. The gelcoat manufacturer recommends 2-3mm spray nozzle at a 5-bar pressure, so I am using FN3 (2.4mm) nozzle. The cup is half full and you can see on the video that there are small drops falling from the nozzle when not spraying which I think is OK. However, when I pull the trigger, very little gelcoat is flowing, just the first drop. I tried to increase the pressure up to 8 bars and it's all the same - no gelcoat is flowing, just the air at a high pressure. The compressor is 256 l/min (9 cfm), 10 bar. Do you have any idea what's wrong?

As said probably too small nozzle.  Your flow rate and pressure seems perfectly reasonable for gelcoat spraying.


Warren Penalver
Easy Composites / Carbon Mods - Technical Support Assistant