Where do you put this stuff? What does it do?
Goes directly on your arse or the chamois. It stops chaffing and what is effively nappy rash.
Is it an acquired taste? Do you get used to it ?
Minty stuff is an acquired taste. You do get used to it. It feels wierd at first but then you stop noticing it.
Do you use it for every ride, road and mountain, or just long road rides?
I use it on wet rides, hot rides and long rides regardless of bike choice. It is often less important on the mtb as you tend to stand up and change position more so you get better ventilation. Some people find they don’t need it, if you’ve never had chaffing issues then I wouldn’t bother. For me it improved comfort massively on long rides where I’m spending 5-6 hours in the saddle (not the cafe). On really long stuff it is invaluable – wouldn’t have finished my 700km ride last year without a large tube of the stuff.