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Water drys far quicker than oils. Therefore watercolour paintings dry quicker than oil paintings.
And because oils don't dry quickly, you have to wait for each layer of paint to dry before you lay another layer of oil paint over it. And then you may paint more than 2-3 layers of paint, perhaps 4 or 6 layers, in the drying process before your oil painting is complete.
Whereas watercolours usually takes 1-3 layers . I like using a raw sienna undercoat if I want a mellow romantic atmospheric watercolour. And if I use liquid masking before painting the block-in layer stage, that means that the masking and the block-in layer has to dry, before I can remove the masking and fill in the blank spots, for highlights, etc.

Thank you @artguru! Increasing my knowledge today. 🙏

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