Have used it a few times over the years in Awlgrip and more recently Interlux's 2 part urethane. Both had the desired effect of killing the gloss of the enamel. It can be used in different proportions depending on the effect your're after. There is a limit to how much can be added though. The key to any of these additives is keeping everything well mixed throughout the process. Best of luck!
Rod
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