HENRY 663 Outdoor Carpet Adhesive is a “best-in-class” latex adhesive for exterior installations of indoor/outdoor carpet. Henry 663 adhesive was designed for exterior or interior carpet installation and is a solvent-free for reduced health risks, a lower environmental impact with a strong initial grab. This non-flammable adhesive may be used in areas where flammable adhesives pose a health risk due to fumes or fires. Use this adhesive to adhere most indoor/outdoor carpets with polypropylene, rubber-backed (foam, marine, waffle), urethane, woven or non-woven/needle-bond backings. Ideal for use with artificial turf. Sold as a 4 gallon.