Of course one should "run a patch down the barrel". I would never consider squirting WD-40 or any other lubricant directly down a barrel.Do that and you're asking for problems. WD-40 on a cotton patch, pushed through the barrel, followed by a dry patch is just fine.One should always follow with a dry patch if the gun will be shot before it's again cleaned. A wet patch is used only when the weapon will be stored. Even then, you need to be careful because "loose lube" can run into the action, the wood stock, etc. Of course, if you have a special firearms lube along on your canoe trip--and most people don't--go for it. I suggested WD-40 simply because it comes in a tiny spray can and is useful to keep saw blades and axe heads from rusting and to free frozen stove parts, bolts on canoes etc.
Cartop Kayak Carriers
Canoe Pack Liner