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with oil paints ,some colors are naturally transparent.(oxides,lakes,etc.) The 15th + 16th Century Masters knew that in order to give these colors their maximum luminosity, and take full advantage of a wide variety of tones and tints with each pure color, these could to be layered ,one upon the other...
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Try draining all your tube colors on blotter-paper 24-78 hours proir to mixing them with your medium...tube paints are already too "fat",so by adding more oily mediums, they will dry slowly, and even when dry to the touch, are not fully dry ,and so not stable enough for subsequent coats. Try...