Transparent polymers like polycarbonate (PC) and cast acrylic (CA) are widely used in aerospace due to their light weight, impact resistance, and optical clarity. However, there is limited information on how coatings affect their mechanical and optical properties. This study aims to assess the impact of heat treatment and gold coatings on the hardness and light transmittance of PC and CA. PC was cut using waterjet, and CA was laser-cut. After cutting, both materials underwent heat treatment at 150°C, followed by gold coating using magnetron sputtering. Vickers hardness tests and optical transmittance measurements were used to analyze the results. Key findings show that heat treatment increased the hardness of CA by 15.6% and PC by 16.9%. Gold coating further boosted hardness by 13.8% for CA and 20% for PC. In terms of light transmission, uncoated CA allowed over 90% of visible light through, which dropped to 30-70% after coating. Similarly, PC's transmittance fell from 90% to 20-50% after coating. The gold coating also provided effective UV protection for both materials. These improvements in hardness and UV protection make coated PC and CA promising materials for aerospace applications.