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All WD-40 is for is to REMOVE water condensation, its to "soak" rusted parts to "Help" remove that rusted part(s). IT IS NOT A LUBE...or oil.
Get a can and slowly read the label so you can understand it better.
If you are afraid of rust getting to the cylinder walls inside the engine, just squirt some 10w30 oil inside the cylinder spark plug hole (people that put their cars into storage do this all the time) and about two oz is all that is required. Spin it over without firing and leave it alone till you're ready to get it running again.