@ Homer,
I tried a spray can of 'Pot belly black' from Bunnings on a friend's .452, 230gr Lee cast projjies.
stood them upright and gave a coat ,air dry 24 hours, 2nd coat. dry 24hrs
then popped them in the BBQ for about 20 min.
Came out good looking, withstood the 'acetone wipe' test, lost a few flecks on the smash test.I am awaiting results from my friend-old mate's been busy with a few things.
I do not have a dedicated oven to heat treat correctly, and realise that its more fun and therapeutic, to make lubes the OLD way

I surmise the electrostatic method will give the best results, going by the mounting body of evidence.
However, it may be worthwhile contacting HI-TEK who manufactuers the product here in Oz. ( he posts often on CB, you can PM him)

Cheers