I did this today.
I used Chipex paint and applicator.
Overfilled the Lettering - waited 5 mins/Hub ( timed accurately) then carefully wiped off the excess with Chipex Fluid.
Great result - I like it!
Not a massive visual impact - but close up it looks very good (well I think so!!).
And I am pleased ...took about 30 mins ...well tea was also consumed and I took my time!