OK, so we’ve been getting some snow storms around here, and I of course been shoveling (which leaves a much cleaner walk than those pathetic little electric snow-blowers so popular around here - but that’s a different topic).
Anyway, in some snow types (there certainly are different characteristics for snowfalls, some may be light and fluffy, some dense and wet, some icy, etc.) a lot of snow sticks to the shovel after dumping a shovel-load, which pretty much sucks as you either have to bang the shovel against the walk to clear the shovel, or else do twice the work (since you’re lifting the sticky snow again…).
So, since this is a pain, I thought about several concepts, including spraying the shovel with telfon(!), when lo and behold, I spy an ad in the Family Handyman claiming you should coat your shovel with WD-40 for just the reason I stated above.
So the question is… does it work? 
Probably for a little while.
Snow-sticking problems aren’t so severe with a plastic shovel.
I would imagine it would work. WD-40 stands for “water displacement 40th try”. Since it repels water it shouldn’t get washed off by the snow or anything. Go ahead and try, I don’t see why it wouldn’t work.
Use Rain-X or try some car waxes. Always worked for me. WD40 and other petro based products will work for a day or two.
I was always tempted to try Pam cooking spray, but I always forget until I’m already out in it. I’m too lazy to drag my butt back into the house once I’m all bundled up in wet boots, etc…
This may be a cheaper and more environmentally friendly alternative to WD-40…
Silicone spray works, too. You’ll have to periodically replenish anything you put on, though.
Car wax sounds like a cheaper alternative - I’ll try some.
If you’re going with car wax, I recommend a cheap spray-wax like Turtle Wax. You should be able to shoot it straight on the shovel without bothering to wipe it off.