As usual, too many options and unclear what I should be searching for.
The primary use is a couple of control dials on an air fryer. They have black dimples on a black dial and so are pretty much invisible. I would like to put a dot of white our dayglo paint on them so they are easily visible. It just needs to be a very small blob so a fine tip on the applicator is required. I assume some kind of paint but waterproof.
Would Tipex be suitable? The applicator might be too large, though.
Humbrol enamel applied with a cocktail stick? [Not that I have seen Humbrol enamel for 60 years or more.]
Suggestions of modern materials most welcome.
Cheers
Dave R