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I've tried several times to print some black cotton tshirts with Speedball Opaque "Black Pearl" paint and every time, I've had the screen start to block up with dried ink within approx 10 minutes of printing. I typically do 2 printing passes and a "flood pass" as I've been taught to lay a heavy layer of ink over the screen to avoid it drying.. but this stuff still dries up pretty aggressively.

Doing some research I see that Speedball sells a "retarder" additive. I can't find any PDF info on how much of this should be added, or what sort of printing times I can expect with it.
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