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Many people do that but I think it is better to put a transparent thin cote and rub the coat with a cloth to make it more uniform (imprimatura) rather than a thicker one. Personally, I prefer to put a thin coat of paint with turps only (imprimatura) or turps+very small amount of linseed oil for oil painting (thicker and slow drying).
Yes you can.Thanks
I do. Thanks Nanabean