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Go to any good garden center and buy a bag of vermiculite . After you have melted your alloy and fluxed it real good put about a 1/2 inch layer of the vermiculite accross the top of your melt. It is an extremely good insulator and keeps the contact from the air away as well as preventing a great amount of heat loss from the exsposed liqidous . It floats nicely and does not break down under alloy melt temps. I picked this trick up working in a high voltage cable mfg. facility where they used this over a a large vat of molten tin that they ran strands of bare copper wire through to coat with tin.
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