King Grip Primer helps create an extra bond on porous surfaces prior to application. Primer helps to create a stable surface for our tape to adhere onto, on a porous surface (wood, concrete, stone, marble etc) moisture can travel through to the surface, this moisture can then lift the film. Simply brush down (only onto the area where you will be applying the non slip stair treads) like paint; it typically dries in 10~30 minutes dependent on application temperature and surface type. We offer the primer in either 34 fluid ounce (our most popular size) or 17 fluid ounce, a 34 fl oz container seals 50 square feet while 17 fl oz seals 25 square feet of our non slip stair treads.