For keeping the pump from rusting - protect it by adding "pump saver" for airless paint spray units in the paint area by home sprayers at home depot.
The stuff is blue in tent, and you can tent it using RED or another food color agent to get your color needed. It mix's with 1 gallon of water per little bottle - and it is like 1.49 a bottle. It will NOT freeze and just to be sure I would add a bit of anti-freeze to the mix.
This is the formula I came up with for the bank I did a pump for here in Kansas.
Travis E. Towle
Topeka, Kansas
785-357-1004
