Another alternative is the military wrap concept.

In this method the spring is shot peened to provide spring rubbing-surface lube reservoirs. The assembled spring is then immersed in boiling heavy weight moly-grease for a time. The grease is then allowed to cool and solidify.

The grease impregnated springs are wrapoed with 2" wide hessian strip (over the grease) and covered with a thick gauge heat shrink tubing.

This type of preparation ensures maximum spring compliance and wear resistance while still being light. It only adds about 500 grams mass to the spring assembly.

The main disadvantage is the time to prepare and clean up the springs and the shot peening cost.