I normally coat the mold cavities on a new mold with a few wooden matches to blacken them. Got a new lee 6 cavity TL358 -158 today and thought I'd try a mold release that I bought at local reloading shop. I ran through a couple hundred and most of the time 1 or more stuck in the mold and I had to rap them with a club. I played with the mold temp some by waiting longer between pours. If mold got a "little" hot, I had lots of sticking. Waiting 30 seconds or so between and sometimes all would fall out.
So much for that experiment for me. I'm going to clean it well and start over blackening with kitchen matches. If mold release works for others, great but, I'll not waste any more time with it.
Regis