The National Marker Company sign with the legend âSAFETY FIRST - PROTECTIVE EQUIPMENT IS AVAILABLE - SEE YOUR SUPERVISORâ is often used at construction sites and industrial facilities. It asks the employees to contact their supervisor for personal protection equipment. The safety sign uses contrasting colors to ensure clear visibility from a distance and in most lighting conditions. The material used in the PPE sign is UV resistant, chemical resistant, graffiti proof and has an NMC Sign Muscle coating that protects the graphic against fading, scratches, scuffing, mold, and moisture.