Hopefully without starting yet another debate on chain lube can anyone tell me how, when using wax chain lube, you determine when it needs re-lubing. I have always used oil, the lack of which is obvious with little more than a glance. This dry wax stuff seems to be fairly invisible though. Is it just a matter of feel, or top it up once a week or how? The lube in question is Halford's BikeHut Drywax Lubricant which has PTFE in it as well as the wax. I was unable to get any Finish Line and the Halfords was all I could get.