I decided to try GormTransMonsters recipe to recolor some mimp and they came out okay I think. Maybe a little darker than a real premium orange but that might be because I used yellow figures rather than neon yellow. I used a Wilkinson neon orange pen, they come in a pack of three with green and yellow and cost a quid. There's a genuine premium orange and a neon red for comparison. Really liking the zombie and spring heel.
The werewolf and scientist were my first attempt at uv reactive mimp and they came out pretty good compared to a regular neon green. Still not as reactive as an untouched series 2 neon so I might try a uv neon pigment next time. I used a uv security pen for these two.
I'm going to try for pine green next and maybe an orange great beast from the board game packaging but I need a neon yellow for my collection first.