The effect of reinforcing the hand sprayer-based coating through multiple layering was also studied to observe whether the transparency becomes compromised. Derived from the transmittance graphs (Figure ), by repeated layering up to seven-times, the transmittance values at 550 nm (the inset in Figure ) are still as high as 99.33%. On average, every layer of deposition only decreases by 0.07% of transmittance. Accordingly, zero transmittance would require a more than 1000-times coating, suggesting that the degraded color and image quality in the spray-coated display panels are unlikely to occur.