Thanks for your input.
In the last 12 months, we discovered that TonyN's alloy was highly contaminated with Zinc and other impurities. Many had tried to help and advise how to obtain a reasonable alloy how to remove Zinc and other contaminants. To this date, we have no idea what he is doing, as after 15 minutes his baked coating simply washes off with solvent.
Then he wanted to rewire his oven, and had no idea of electricals. He was advised to use a certified electrician to do the work. This was not done.
Many had advised TonyN that he requires clean alloy with no other lubes that may contaminate cast. No reply and it is really not known what and how he does things.
This is all a mystery.