>>95894948
Mine don't come out nearly that good yet, but my advice is to use your single best brush with the sharpest tip, or just one that you seldom use except for extreme detail work. Thin the paint as normal but test it on your nail or skin to make sure it will flow properly and go ONLY exactly where the point of the brush is.
You do have to be fast because, at least in my case, the tip will dry pretty quickly. My last seals probably would have come out a bit better if I had a bit more patience and worked slower, but they came out decent enough