The mixing ratio depends on the intensity of the color that you want to produce. The concentration of powder determined by the thickness of your coating or casting. Start with a small portion of pure metallic powder dye first to mix with the resin. If you want more opaque effect, add a few more. You cannot add to much metallic colour dust, or else, the resin will not cure.
To achieve a similar level of colouration, thinner coatings will need a higher percentage of pigment than thicker castings. You have to experiment with the ratio and by your own tests and evaluations, determine suitability of such products for their specific use. We recommend 1g of pigment per 1-5oz of epoxies. 25-50g of pigment per gallon of peelable paint.