The BEST way to accurately measure the resins in the correct ratio for small & large projects alike.  The pumps "live" in the cans and are ready for service at any time.  Small batch?  Maybe 2 pumps of each is all you need!  These pumps ratio the product so that 1 pump of each is the correct ratio.  No need to measure, etc...  Be sure to install the correct pump for the correct hardener since the ratios are different!