Originally Posted by
sekaijin
2) it's NOT a good long-term rust inhibitor because it evaporates away, leaving no long-term protective coating. So the inside of the frame is better treated with Framesaver, which dries on permanently.
The oil components of WD40 do not evaporate. The solvents evaporate quite quickly (as in you can watch a thin layer evaporate) but the petroleum sticks around. It is not a very thick or heavy oil, which makes it awful for lubrication since it just gets pushed away but for sitting on an untouched surface to keep it from rusting, it will stick around.
The reason the other poster mentioned using WD40 to remove excess framesaver is that WD40's solvent properties are so good (while the oil can just be wiped away)