Roberts 6399 is a very aggressive, high-tack transitional adhesive that installs like a pressure-sensitive adhesive but firms as it cures to form a permanent (hard-set) bond. 6399 combines features of both permanent and releasable adhesives, making it suitable for different installation needs across a wide array of resilient flooring and modular floor covering types.

The adhesive offers excellent plasticizer, pH and moisture resistance to withstand extreme environmental conditions. With superior shear strength, 6399 will perform under heavy rolling loads and in all traffic conditions. Features include: 

• Semi-Wet method set requires installation within the 20- to 30-minute working time to form a permanent (hard-set) bond
• Compatible with a range of flooring types: resilient, vinyl and sheet goods, and modular carpet
• High moisture resistance in a variety of environmental conditions
• Maximum moisture tolerance of 99% RH/12# MVER
• Stability and performance under varying temperatures and humidity levels
• Superior shear strength
• High resistance to lateral forces
• Ideal for environments with heavy traffic or rolling loads
• Durability with Reduced Flooring Movement
• Minimizes shifting, buckling, or gapping
• Ideal for vinyl sheet goods or large-format tiles under heavy rolling loads
• Ease of use and cleanability
• Can be applied with a trowel or roller
• Clean up with water (before curing) or mineral spirits (after curing)
• Safe to Use
• Low odor and low VOC
• FloorScore and CRI certified