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Hi Prior,
Assuming this is the West & Senior pigment from Easy Composites, 10% is not an issue albeit the darker the colour, the lower the percentage needs to be to achieve full opacity so black would be fine at 5% whereby the white (as an example) tends to need to push higher to around 10%. Whilst you don't want to account for the weight of the pigment in the ratio of resin to hardener, you could put the pigment into the resin first to give you an unlimited amount of time to mix being careful to ensure you have scraped in the sides, corners and bottom of the pot and thus thoroughly dispersed the pigment before then adding the commensurate amount of hardener to account for the resin weight (without pigment).
I hope this helps but let us know if you continue to have any issues.
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