A lot of good thoughts previously stated. I was told by Bego(which I use for C&B),that it's not good for this situation. You need a phosphate bonded investment, like whip mix hi temp. No ring liner- straight water(distilled). No special liquid. No debubblizer. 1&1/4 turns on casting machine. I run up oven ( 2 stage ) to 1300 degrees F. Then bench cool at least 4 min. This is important, if you look at the Sprue side of the hot ring you will see hairline cracks, if let to bench cool they will disappear. Only drawback is sometimes I have to touch up juncture at gold to plastic area with solder. But no flash in unwanted areas. I use direct Sprue technique. Sometimes I will use a secondary small wax Sprue from main Sprue to that juncture. On wax pattern I use monomer or alcohol. Hope this helps.
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