Incredibly tiny stone chip - but through to metal

[minefields]

You could mix the paint and clear together and apply thin layers to build it up to its level. That's what I tend to do.

Another way is to make it slightly proud then using a fine wet and dry sand it even and then polish it up. There are a few helpful threads on detailing world that show how best to tackle stone chips

[Scarum]

Some chips you have to enlarge slightly to give the paint something to key on to.

[SRGTD]

Yes, a toothpick or cocktail stick are pretty good for applying paint to very small paint chips. I find brush in the cap of the VW touch up pencils far too big.

[joe6]

I have bought a set of 10 child paintbrushes at about £1 the set to deal with a range of small chip sizes. Seems to work. Never thought of a cocktail stick though for very small chips - clever idea.