Right now I'm using a Guar Gum Size. I've tried with 0,5% and 0,6% guar/water (5/6gr per Liter) ratio and i can say that it behaves somewhat ok I've not tried yet the carrageenan so I can't tell you anything about the difference. But it works. I found that 0.5% is nicer for my cheap acrylic colors. ...