For repairing large, hydrocal castings such as a stone wall, what is the best glue? I have read white glue but that doesn't seem intuitive to me. Seems like it wouldn't bond or be strong enough? I have a wall that has a very clean break and fits back together so cleanly the break line is imperceptible. So, once I glue it and then stain/finish the front, it will be like new. I just don't want to "experiment" w/ this thing. Is sorta unreal. As many hydrocal castings as I have dealt w/ over the years and this is the first one I have broken. I even thought about Gorilla glue, but that seems like if any at all leaches to the front, then I will see a line when I finish the casting. My intuition says I don't want any dry glue near the finished stone surface at all. Thanks.