Should you use GT85 on your chain? I've been told by various sources that WD40 is bad for your chain so have avoided using it. I've seen people using GT85 on their chains but I'm not really sure how the two products differ. So my question is, should GT85 be used on your chain? Or, does it have the same damaging effects as WD40?
It appears that there are several products under this name, a general-purpose solvent/protectant and a dedicated bike chain lube.
Reviews on Amazon are rather mixed... One fellow claims no better than WD-40, others appear to like it.
Chain lubes are always controversial and seldom tested in a rigorous manner.   

WD-40 is essentially a cleaner/solvent and has no  more lubricating ability than say...Kerosene.
The best chain lube I ever tried is sadly not being made any more... Schwinn Factory Wax.

Clean-running, persistent, and according to testing by Bicycling magazine, among the top for wear and abrasion resistance.

To my way of thinking, keeping the chain clean and free of built-up crud and goo is as/more important than what sort of lube used.