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probably

I know it is counter intuitive, but more hardener actually makes it harden more slowly. I think heating the mold is more important than the formula shift. I find if I don´t have a hot mold, it hardens from the center out and the corners and points don't form well.

I am on luremaking hiatus currently. My last casting was of the 9" plug and I spray painted it but did not it epoxy it. It has been sitting in plug bag in car and is getting fished. Haven't caught on it. But no cracks. I flex it every once in a while. There is a quite a bit of flex. And no cracks showing. RideHPD: 1) the 36hrs cracked one was not subjected to car heating it went into car on the same day as I went fishing and it was a cool day to start with. 2) All the plugs have spent a number of days in car, some more than others. 3) I love your analysis ideas. I will refer to them should the etex thing and trying a new batch of the resin does not result in the problem being resolved. I'm ordering some more foam soon. Alumilite kindly offered me 25% coupon. Here's the picture Anglingarcher requested. The foam was purchased directly from Alumilite, not via Amazon.

I do the same thing. I use floral wire. I just wrap a few turns around the R and cover it with heat shrink tubing.