We degas with regular bronze degassing tablets, can't remember the name of them. Not sure on the overheat really, I'm just an employee there and have kinda taken making this post upon myself because im tired of making the same casting twice, my boss has been doing it for a long long time and just seems to know when the temps right.
Hey Frosty,
Thanks for the welcome, yes LG2 is what we refer to as gun metal here.
I'd say it's as safe as any other metal haha, we get requests specifically to use gun metal as its self lubricating and often used on gears and things like that.
We're in the UK and yes they're gun metal bronze.