It is possible. But a coat with silicone resin paint is significantly more water-repellent and algae-resistant. K.
We were told that when mixing the paint into the plaster, you can notice color differences depending on how dark the color is supposed to be. It is always recommended to tint the plaster slightly and then paint over it with a good quality paint in the desired shade.
I can only report this much. Fertiggarage Rekerskin tinted plaster, half a year, grimy. Painted with Sto facade paint, exposed to weather for one year, clean.