Thought I'd resurrect this thread.
I received my trial bottle of Squirt and duly applied. I've since had one super wet muddy ride after I fully degreased the chain and applied it as per instructions.
Its easier to apply than the Putoline chainwax and doesn't involve heating tubs of wax it melt, which is a plus.
It does take overnight to dry, being water based, so is useless for the last minuters amongst us.
I rode for about 3 hours in typical Mendip winter conditions, hosed my bike down, put it in the garage and I've left it since Sunday.
I've just sorted the bike for the next ride and found that the Squirt lube is nearly completely gone from the chain. However, I'm running a PC971 without rust treatment and its been left, untreated and wet since sunday lunchtime - there was very little rust on it, suggesting that there is a film of lube left on the chain. I've ran a few links through my hand and there is a waxy feel to my hand afterwards, so its still there.
The chain is also very clean. Much cleaner than say, R'n'R' Extreme (the blue one) and Putoline. I ran a stiff bristled brush dry along the inner and outer surfaces of the chain, which knocked off a little dried mud as dust, and went straight ahead and lubed up with what was left in the sample bottle. Nice and easy.
Jury's out on longevity of the chain and I don't think Squirt will stand a five or six hour ride in Mendip mud, but I've been impressed enough to buy a couple of bottles to try it for longer. My chain checker will duly be wielded to monitor progress...