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I've never seen the need... I use small batches ( 6 plugs at a time = 2 tablespoons hardenr and 3 tabelspoon of resin... added in that order) my plugs are in the spinner ( heated) and I heat the e-tex prior to mixing.. this seems to cure most ills with the stuff... i find it does yellow a little with time.. but I'm no selling them so I can deal with it...
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