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Epoxy can be a real pain at times. Temp,humidity,thickness,normal purpose all add to the equation.Rodbuilding epoxy coat can still run after 4 hrs at times,2 ton will cure very slowly under 60 degrees,mix can be off if not done thourough and a light pointing at it can make it cure quicker.3 hrs is a safe time for turning but check it to make sure.The left over for the mix is good to keep on the bench so you can check it. I use etex and keep a close eye on the plugs. you can sand the sags to smooth them out an cover it with another thin coat.Just keep an eye on it. a light pointed at it about 16 in away from the plug will keep a good temp if the area your working in is cool.Hope this helps. Ron
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