I did purchase a can of sight black spray Hoppe's brand I think . It was a pain to use and like the marker, wiped off easily, sometimes accidentally when loading. Unlike the maker, the can had to be shaken then sprayed all over the front of the rifle, then the top put back on and can returned to the bag or box.
With the marker, take off the top, wipe the sight, replace the top and drop into the bag, or box - done.