Spartite is a a pre-measured two part polymer that is poured into the cavities between the mast and the partners while the mast is in the boat.
Kits come with complete instructions, pre-measured Spartite cans, modeling clay, foam support strips, pouring cup, stirring sticks and plastic gloves
To estimate the quantity of Spartite needed, measure the square inch area of the mast section and subtract that number from the square inch area of the partner opening. Multiply this number by the desired depth, which must be at least 2", then add 1/4".
If you purchase too little, a further amount can always be mixed and added later.
Example: deck opening 50 in², mast 30 in² x depth of pour 2.25" = 45 in³