Use fast-drying paints (like those mixed with more solvent) in early layers, and slow-drying oils (like poppyseed or linseed) in later ones.

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Each subsequent layer of paint must have a higher oil content (fatter) than the layer beneath it. The initial layer (the "lean" layer) is thinned with solvent like turpentine or Gamsol. The final layers (the "fat" layers) are mixed with linseed or stand oil.