Nothing at all, once the product has ample time to set you are ready to take on the day, rain or shine.
Nothing, the product will not run, even when you’re working up a sweat.
The product will remain in your hair until it is shampooed out, rest assured that the product will last as long as your day does.
No need to wear gloves, the product will not stain nor leave behind any excess residue, simply rub any residual product into your hair or off with a towel.
The jar is 100 ml, how long it lasts is going to depend on how much you use in any given application; on average about 4 weeks.