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I try not to think about it
Green is also 609 & 290; maybe the 603 is the old 609? The 290 is the wicking variety and can be handy at times.
Red is 271, green retaining compound is the 603. The colors are printed on the containers, but the liquid itself is that color.All of them cure in absence of air, so any left on surface wont dry, but easy to wipe off.