"Notice - This Door To Remain Unlocked During Business Hours" Label By SmartSign | 5" x 7" 3M Reflective Laminated Vinyl 3M AUTHORIZED. Made from Certified 3M components: inks, laminate and films. 3M Engineer Grade reflective labels shine brilliantly at night. DURABLE VINYL. Conformable vinyl has 7-year outdoor life and aggressive adhesive backing. LAMINATED. Graphics are protected from weather and abuse. Graffiti can be cleaned off. Laminated labels outlast competitive unlaminated or overcoated labels. GIVE A MESSAGE. Convey your This Door To Remain Unlocked During Business Hours message with this label. INSTALLATION. Labels stick to flat or curved surfaces and can be used indoors or outdoors.