Before storing a airless paint sprayer, make sure all water is drained out of hoses and gun. Do not allow water to freeze in the sprayer, hose or gun.
Do not store an airless sprayer under pressure.
If your paint sprayer will be subject to freezing, use Pump Armor or full strength Liquid Shield.
Store your airless sprayer indoors!
When you turn off your paint sprayer after using a pump protectant, try to do it so that the rod is down, down in the fluid section.
If you want to see some pictures of paint sprayers that have not been taken care of, see The Wall of Shame.