Today I tried the Lowe Cornell Fine line painting pen on some stone chips for the first time. In a word -brilliant, it has the combination of very fine dots of paint and actual paint flow which means you can get as fine as you like (or really how steady your hand is and how good your eyesight), but also have the flow to allow you to fill larger chips.
Ive tried cocktail sticks - ok for small chips but getting the correct amount of paint on the stick is a time consuming challenge, various brushes- again getting the right amount of paint on is difficult, plus both of these require consta