National Marker Company caution signage with legend ?CAUTION - EMPLOYEES ONLY? is commonly used as a part of safety measures at industrial locations and commercial jobsites. This sign clearly informs the visitors and passersby about access restrictions in certain areas where only employees are permitted. This weatherproof caution sign is OSHA compliant, making it ideal for indoor and outdoor use. The employee only caution signage has Sign Muscle coating that makes it resistant to high and low temperature, scratches, fading, graffiti, and scuffing. The UV-cured coating creates a stronger bond and boosts the color and clarity of the sign.