With Etex there`s a couple of must do`s to get it to set, first measure the two parts exactly and I mean exactly, I use the measuring spoons that cooks use, they come in various sizes depending how many lures you are making.
Secondly you have to mix thoroughly for at least 5 minutes making sure all the epoxy on the side of the cup gets mixed in, let it sit for 15 mins then blow on the mix through a straw to get rid most of the bubbles, when it starts to thicken apply to the lure then blow on it again.
hardening times depend on humidity and temperature anything from 10 to 24 hours, but it should set rock hard.