Spartite is a tailored solution for filling the gaps between the mast and the partners on a boat, consisting of a pre-measured two-part polymer that is easily poured into the cavities. The kits are equipped with everything needed for a smooth application, including complete instructions, pre-measured Spartite cans, modeling clay, foam support strips, a pouring cup, stirring sticks, and plastic gloves. Calculating the required Spartite quantity is simple: Measure the square inch area of the mast section and subtract that number from the square inch area of the partner opening. Multiply this figure by the desired depth, which must be at least 2 inches, and then add 1/4 inch. If you find that you've purchased too little, additional Spartite can always be mixed and added later.