Glass rimming on cocktails does two things. Firstly it makes the glass look simply divine and secondly enhances the taste of the cocktail.
If it’s all about keeping up appearances and the simplest way to do this is water. simply moisten the rim of your cocktail glass and twist it into whatever sort of powder you want. For the best looks try using sugar or cocoa powder, rubbing water on the rim to be able to make it stick. This gives your cocktail a instantly more professional feel and look to it.
Taste is always important too, try experimenting with lemon or brandy instead of water when you rim the glass with cocoa or sugar to be able to give it that sort of tangy or crisp kick to it. Make sure you keep in mind that genre of cocktail, for example you wouldn’t mix creamy cocktails with salt and lime rimmed glass. It may not work out for you the first time but on the whole rimming can usually be a extreme success. For example, salted rim on a glass for a margarita. If That’s not good enough for you try crushing things to rim, for example get 3 of your favourite dry biscuits, crush them up till they’re powder, then use these to rim your glass. if they don’t stick rub syrup on your glass and try again and just keep experimenting until you find something that is perfect for you.
Rimming the glasses is possible with almost every liquid and powder. So experiment where possible and make a mental note of what you’ve done.