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As Hanaldo says you really need a dedicated epoxy pigment. With powder it can be difficult to get an even mix once added to the epoxy leaving a slightly streaky effect to the cured part. Also because of the extra mixing you have more chance of introducing air into the resin. With pigments the solids are pre mixed by the manufacturer with resin make mixing much easier. The % needed can vary depending on the manufacturer. With West & Senior it's 5-10% by weight.
Warren
Carbon Copies Ltd
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