Might have to give that a shot if I ever try CR's for coyotes here.

What happens when it snows or rains on that chalk? Does It get all gummy and would slow down your lock. Or does it just wash off.

Good question. The author probably doesn't get much rain while snaring wolves in the snow. Down here?? Guess someone will have to try it out and report back, eh?

I've hung a lot of CRs and the only thing I do is spray paint them a dull grey. It seems to work just fine. Besides canines are color blind so I see no need.

Petersburg is in SE Alaska, he gets plenty of rain, believe that. As far as the chalk holding up to it, I'd think it would work great if it's staying frozen, if it's above freezing at all I could see it gumming up like beav said.