Hey Paul, there are several things that can cause what you are experiencing. The temperature in your shop is a huge factor. Most resins need to be stored at room temperature. The resin that you are using says on the label "Store and use at 73F/23C". Shaking your resin before pouring is...
WOW The amount of detail just in the lower face is stunning and the eyes look so real. Amazing as usual Joe! A lucky someone is going to be very happy!