Good for displacing water (WD = water displacing; 40 = 40th try to get the formula right). Good for spraying on pruning shears and saws to keep the pitch from sticking before cutting pine boughs. Easily bettered for everything else I've used it for.
Thought I didn't like the stuff until I found a can of it on the road side during my daily walk to the post office. Brought it home, and while I was cleaning my gas operated shotgun, decided to try it on the residue that accumulated on the piston..in the past, I've needed steel wool to remove that stuff. To my amazement, WD_40 is an excellent solvent for the residue. As a bonus, it is a lot less volatile and flammable than paint thinner and other solvents that are effective on really tough residues...
Keep it around all the time now, but don't use it on the bike.
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