Yeah, that's the stuff, not to worry, it's clear when it is dry. I've not had any wheel slip issues with the Murphy's locos, 182, 121 or 071, I suppose it depends on what it's pulling, 10 wagons work fine, 4 coaches are fine, have not tried any rakes bigger than that. The 071 was derailing, but as I say, seems to have mysteriously fixed itself.