Mapei Ultrabond ECO 399 Heavy-Duty Pressure-Sensitive Multi-Flooring Adhesive Ultrabond ECO 399 is a heavy-duty, pressure-sensitive adhesive built for a wide variety of resilient flooring types. High-moisture-resistant and heavy-rolling-load-resistant, with enhanced dimensional control properties to keep seams tight and gaps controlled over time. Also usable for flash-coving installations. Approved for use with vinyl composition tile (VCT), luxury vinyl tile, luxury vinyl plank, vinyl enhanced tile, quartz tile, bio-based tile, fiberglass-reinforced vinyl sheet flooring, solid vinyl sheet flooring, reground rubber underlayment, rubber sheet and tile flooring, cork underlayment, and vinyl-backed and polyolefin-backed carpet tile. Aggressive, pressure-sensitive tack develops after an open (flash) time — on nonporous substrates, let the adhesive sit 30 to 60 minutes or until dry to the touch before installing flooring; on porous substrates, flooring can go into semi-wet adhesive or wait for the same dry-to-touch window. Apply only as much as can be installed within 6 hours, and roll flooring with a 75 lb. or 100 lb. roller once set. Water-based, low-VOC. Cleans up with water while the adhesive is fresh. Click here for Technical Data Sheet Spec Detail Type Heavy-duty, pressure-sensitive resilient flooring adhesive Use VCT, LVT, LVP, vinyl enhanced tile, quartz tile, bio-based tile, fiberglass-reinforced vinyl sheet, solid vinyl sheet, reground rubber underlayment, rubber sheet/tile, cork underlayment, vinyl/polyolefin-backed carpet tile Moisture resistance High Load resistance Heavy rolling loads Flash/open time 30–60 minutes, or until dry to the touch Working window Apply only what can be installed within 6 hours Rolling 75 lb. or 100 lb. roller after flooring is set Traffic protection Light traffic 6 hours; heavy traffic 12 hours Cleanup Water, while adhesive is fresh/wet Package sizes 1 gallon, 4 gallon What flooring types is this approved for? VCT, luxury vinyl tile and plank, vinyl enhanced tile, quartz tile, bio-based tile, fiberglass-reinforced and solid vinyl sheet flooring, reground rubber underlayment, rubber sheet and tile flooring, cork underlayment, and vinyl- or polyolefin-backed carpet tile. Can I install flooring right after spreading the adhesive? On porous substrates, yes — into semi-wet adhesive. On nonporous substrates, let it sit 30–60 minutes until dry to the touch first. Can this be used for coving up a wall? Yes — it's also approved for flash-coving installations. When can traffic resume after install? Light traffic after 6 hours; heavy traffic after 12 hours. Sku: 1951204