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Thanks NorCalNomad. I will bow to your knowledge.
All the epoxies I have used, turn brown, but I guess I have not specified UV stable.
In any case, the method should work on Epoxy as well as it works on PU.
As a kid I favoured this method as it did not chew our wetsuits.

Seek out a can of monster paint: https://www.amazon.com/Monster-Paint-Cl ... B00EOXZOX2

Good grip and won't yellow.