Where you get them bigbob

Stic, I did a google search for the Uni-posca pens and they are readily available through Amazon, DickBlick and others.

Here's one example.
https://www.amazon.com/Uni-posca-Paint-Marker-Pen-PC-1M12C/dp/B001VB4T86

time difference means a delay in answering, sorry. I get mine from office works or similar. Newsagents too might stock them. Very easy to use. I just lay down one coat of finish and then apply lettering  followed by remaining coats.

I use Tru-Oil on my bows and find some inks, specifically Sharpies, don't work well over it so after a coat or 2 of Tru-Oil I spray the area to be written on with satin poly, write the info and add more coats of Tru-Oil over that.

Hey Robert, sorry I did not see your question sooner. The Uni-Ball does work with conversion varnish and 2K auto clears, as do the Microns. The Uni-Ball also comes in gold, silver and some other cool colors.
The thing to do is get yourself a few different brands and tip sizes, then experiment to see which suits you best. But if you have the skills like Eric, nothing looks as good as India ink and a nib.

The One Shot letter paint that Brad uses is indeed good stuff, but be careful if you use it. It use to contain lead, don't know if it still does. I know it contains heavy metal driers and  a variety of nasty solvents. Stuff lasts a long time, even exposed to the elements!

Thanks Flem, I ordered a pack of the uni-ball pens 

Thanks for the suggestions and the replies! Mine never seems to look good, I wish I had good hand writing like Eric!!

A surprising number of my lettering jobs are do overs, sometimes 3 or 4 do overs. I did practice to get the flow and spacing early on. After lettering a couple hundred bows one gets the hang of it, even then I have good days and bad days. The pictures are the ones I did on a good day.

I have bad days only
I think I'm trying to hard
My normal writing is ok, I think I just need to write