I used this on a pose and stay skeleton (Halstaff referral) https://www.amazon.com/gp/product/B0057Y8PMY/ref=ox_sc_sfl_title_5?ie=UTF8&psc=1&smid=A1DOFKMTLCPOIO
Pretty easy to use.
That was a really nice color on him Bobzilla. The photos of him "posing" in all positions to be colorized made me laugh. Have to add that I absolutely loved his head and eyes! What cool peepers!! Hope you are doing a tutorial on him or at least show a video of him when he's all out together.
BTW the colorant says it's water based. Any issues with the color coming off? Thinking if he were to get rained on.