I think my concern with be more with the Transtint product itself than
its ability to mix.
I read more and more, and have actually seen (as in with my own eyes)
Transtint fade in normal light from a window. The fading was noticed
when a lamp was moved to clean the table top, and it there was a
perfect, darker circle under the lamp position. Ouch. This happened
in a sunny window, but it only took a year.
If you are using this on an outdoor project, you won't have nearly
that long to enjoy your tint color.