Selleys Liquid Nails VBS Vapour Barrier is a two part epoxy kit consisting of a liquid hardener and resin that, once combined, is rolled onto concrete floors to prevent the transmission of moisture vapour from the concrete to the timber floor. Roller included in kit. Meets the total VOC content limits required by green building council of Australia. Use Liquid Nail Direct Stick Adhesive for timber flooring direct stick to concrete slab. Coverage: 20sqm per Kit