I used a box of desiccant that is used to keep guns dry. The box had an indicator on the bottom to tell when it was getting damp. I also double bagged the engine. Every 4 months I'd open the bags and check the desiccant. Machine surfaces were sprayed with WD. No rust after 3 years. If you let the desiccant go too long it will start dripping water. Don't put it against machined surfaces.