Two-part expanding foam, great for fin encapsulation, securing noseweight, etc. Includes (2) 8-ounce bottles The Expanding Foam features are: Expands up to 25 times it`s liquid volume. (Dependant on temperature and humidity) High temp formula. Perfect for fin root encapsulation. High adhesion rate. Two equal part (by volume) mix ratio. Does not need air contact to cure. Fast curing. Light weight. Easy to cut and sand. Very carvable. Great for strengthening thin wall nose cones or securing nose weight.