A pop 7" senko mold I made.
It took one day each per half, and I let the thinned D2T sealer cure another day.
I added some yellow carpenter's glue to the pop to strengthen it.
Pours great when I inject it, but I get some small dents.
The duct tape on one half it to fill a small gap at the wood perimeter so the plastic won't leak when I hold pressure.
I put a small vent at the bottom of the cavities, and there is almost no flash.