Hi Shoshana ... I don't check this website enough, hence the delay replying.
Thanks for the response. I've had very consistent casting results from H & L but haven't broached the subject of using my own grain with them. I did discuss that with Pino at Modeliamo and he was receptive to it. I've used them a couple of times so far to cast some slightly tricky work and I've been satisfied with the results, although thanks to my models it took some tweaking.
In terms of custom work, I don't do a lot of it and don't plan to, so I'm more concerned right now with finding a high quality, consistent product with lower environmental impact. I'll roll those costs into my pricing and see where that leads.
I'm just setting up an account with Hoover and Strong this week. Have you used their platinum grain yet?