Hi Markster,

interesting suggestion to add isoprop alc to resin. The stuff is not cheap, and there are two parts to it, resin and hardener. Once mixed, I only had less than a minute to pour before the hardening started.

My biggest bugbear was insufficient mixing causing parts of the resin to remain uncured. There was no choice but to junk the casting and try again.

Maybe you can try to dust the inside of the mould with graphite powder? It works with lead tin castings to give you smooth castings.

Rgds Victor