Total Boat 2-Part Polyurethane Flotation Foam 6 LB. Density formula is a fast-setting, high-density, expanding liquid foam that cures to a strong, rigid material ideal for a number of structural and artistic applications, including filling cavities to support heavy loads, casting, sculpting, making plugs for fiberglass molds, creating floating decoys, fabricating stage and stunt props, & much more. This versatile foam can be finished and painted, once cured, and is very easy to cut or carve into shape. Any areas exposed to direct sunlight must be laminated or painted over with polyester, epoxy, or vinyl ester coatings, for proper UV protection. Total Boat pour foam has a simple 1: 1 mix ratio that makes it very easy to use, and it cures quickly at room temperature. Always have good ventilation, and use protective eyewear & gloves when mixing and pouring foam. Though the foam will expand in temperatures as low as 60F, warm conditions of 75-80F are extremely critical for achieving proper expansion yield, as are accurate measuring, thorough mixing, and proper venting of the area where the foam is to be applied, because the foam expands tremendously by volume. Just mix one part resin and one part activator together, stir vigorously for about 25 seconds, pour immediately into the prepared cavity or mold, and leave undisturbed until cured. The foam hardens, with minimal shrinkage, and can be cut to shape easily. For best results filling larger areas, pour in multiple layers to allow a proper cure and maximum strength bonding between layers. If consecutive pours are not possible, the polyurethane foam will still cure mechanically to itself pare to US Composites Expanding Urethane Foam, Fiber Glast Mix & Pour Foam, and Aero Marine Pour Foam. Total Boat Flotation Foam sets up quickly, has high compressive strength, and is a much better value. All Total Boat products are developed for boaters, by boaters. We know what works and what doesn't. 100% made in the USA.