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Every artists has certain preferences when it comes to oil painting mediums
There are many oil painting mediums on the market which assist in the viscosity and drying time of paint and Liquin is one of them. Winsor & Newton makes a Liquin which is a durable and non yellowing. It comes in different thicknesses and can assist greatly in speeding up the drying time of your paint. This video is worth watching to see the different types available and how they can be used to achieve different results.