High rebound is most often caused by incorrect water ring adjustment, wrong nozzle standoff distance, or insufficient air pressure reaching the gun rather than a fault in the machine itself, though worn rotor seals can also cause pulsing flow that increases rebound. Checking compressor output against the gun's actual air consumption requirement at working pressure is usually the fastest way to isolate the cause. Sparkline Group's technicians routinely diagnose rebound issues on site and can advise whether the fix is a machine adjustment or a mix design change. Addressing this quickly saves significant material cost over a gunning campaign.