[Dependable Dave]

I've been curing with the injector in place for 10 years and have never had a problem with the resin curing up inside the tool. Once in a while a small ring of resin cures on the glass around the break but shaves off easily with a blade. I believe it's mostly on the rare occasion when a little resin leaks out away from the seal on the glass. Too much pressure on the resin, or not enough pressure on the seal, or a surface crack.