Our Epoxy of choice is West System. Often when building a kayak it is necessary to use only a little at a time, or other times it is necessary to use a large volume in proportion the amount of fiberglass used. This tool gives values for both amount of resin and hardener needed based on a weight of fiberglass and includes a table for quick reference while working in the shop. Links to the material data sheets for west system 206 and 207 hardeners are included on page 3.
A handy tool for checking angles.
RESIN TO HARDNER RATIOS
When you need more hands in the shop, this chart makes Quik work of mixing epoxy.