LPS-2 is a great rust preventative, because it is light oil, sprays
nicely, and does not dry or harden over time. It also creeps and
penetrates well, so if, say, I spray it on top of a pile of metal
things, it will get to all the pieces in time.

The only minus of it is that it is expensive.

Does anyone know of a cheaper alternative that can be sprayed and does
not dry out.

Thanks

i