It would be interesting to do an experiment and see if heat would affect the curing process. I am going to make some more rock this summer and I found a nice place in a creek where I can let it sit for a month or two and let nature do its worst to the rock then I plan on letting it dry cure in the sun for 2 weeks or so to let the sun bleach the rock even whiter and make it look more like dry reef rock.
However if you read this article (
http://www.oystercrete.com/Journal/?p=74) they did not do any heat treatment ideas but the result of there study is that only water volume affects curing time....
Thanks again for all the imputs keep them comin....
I will keep this post updated as to the status of my rock and my findings as far as seeding.