I always, always, always have three inked up that I carry in my briefcase – in the three loops designed for pens:
• A blue Plaisir loaded with Noodler's Baystate Blue,
• A green Plaisir loaded with Noodler's Kung Te-Cheng, and
• A red Plaisir loaded with Noodler's Dragon Catfish ORG (orange highlighter ink)
These are often considered "fussy" or "controversial" inks. They certainly dry easily in other pens. But in the Plaisirs, they're always ready to go.
I have neither had a dry highlighter, nor bought a highlighter, in several years – beginning with a Preppy I got in either 2009 or 2010 – with the ink I think, and ending with the red Plaisir, where I just took the section and cartridge from the Preppy, and stuck it in the Plaisir's "shell."
Qui tam pro domino rege quam pro se ipso in hac parte sequitur.