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do you mix the tint/pigment with resin or hardener, pre or post catalyst, and is it different for epoxy vs poly resins which to mix with?
Mixing Epoxy Resin Pigment should be done with just the resin component without the hardener so there is no time contraint while achieving the desired color. The same would go for mixing tint or pigment into polyester resin. The tints and pigments should be added before using MEKP so there is plnty of time to find the desired color.
Do you mix in the pigment when doing the initial glassing or with the hotcoat?
You can use the epoxy resin pigment any time during the glassing process. It is typically used in the fiberglass lamination stage but can be used in the sealcoat/hotcoat or mixed with resin and applied directly to the foam as a colored foam stain.