| Symptom | Likely Cause | Fix | |---------|--------------|-----| | | Too high concentration or water too hot (> 35 °C/95 °F). | Dilute to 1ā2 % and use cooler water. | | Foam stays solid, never cracks | Low temperature, hard water, or too much polymer stabilizer (e.g., after adding a āfoam boosterā). | Add a small amount (ā 5 ml/L) of a mild surfactant booster (e.g., sodium lauryl ether sulfate) to reduce film elasticity. | | Uneven cracking ā some spots stay white, others turn brown | Inconsistent spray pattern or uneven surface temperature. | Use a uniform spray nozzle, preāheat the surface, or apply a second thin coat. | | Residue after rinse | Overāconcentration > 5 % or insufficient rinse pressure. | Reduce concentrate, increase rinse flow, or add a final waterāonly rinse with a lowāpressure hose. | | Foam clogs spray tip | Concentrate not fully dissolved; particles of dried surfactant. | Filter the mixed solution through a 100āµm mesh before loading the pump. |
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