The Milliput Black epoxy putty arrived in the post this morning.
It comes with two cylindrical lumps of “stuff”, one black and one grey. I broke a thumbnail sized piece off each and kneaded them together for about 3-4 minutes.
I then rolled it into balls and squidged them into each of the fret markers on the face and side of the neck.
After about 2 hours the putty has started to set and I scrape most of the excess off. After another 2 hours it is ready to file and sand.
I’m very happy with the appearance although if you look at the close-up you can see where the putty has managed to get into the small marks/flaws in the fretboard. When I next do this I will mask round the markers to minimise the clean up work.