I find the purple stuff takes too long to set,and dosn't work as well as the white stuff.If Im trying to attach a frag or rock on a verticle surface,the purple wont hold long enough for the epoxy to set and the piece always falls off when Im not looking.The white stuff will hold,and you can mold it in the tank without it disinigrating, but looks awfull for the first month or so.
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No matter how hard you try, you can't baptise cats.
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