Oil paint Auxiliaries

Oil painting auxiliaries are essential for proper application and preservation: oils (linseed oil, stand oil) that thin and improve flow, solvents (turpentine, odorless mineral spirits) that clean and thin further, and mediums that combine oil and solvent for ideal consistency. There are also drying accelerators (siccatives, alkyd mediums) that reduce time from weeks to days, and varnishes applied only after 6-12 months of complete drying.

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Oil painting auxiliaries are divided into four categories: oils, solvents, mediums, and drying accelerators. Linseed oil thins paints and increases shine. Stand oil is thicker and gives smooth, enamel-like surface without brush marks. Turpentine evaporates quickly leaving only the pigment, while odorless mineral spirits (white spirit) is an alternative without strong smell. Painting mediums combine oil and solvent in different ratios for different layers.

Oil painting follows the “fat over lean” rule: first layers contain more solvent, subsequent layers more oil, for even drying without cracking. Drying accelerators (siccatives or alkyd mediums) reduce drying from 5-7 days to 1-2 days to touch. Final coat varnishes are applied only after 6-12 months of complete drying. For cleaning brushes use mineral spirits first, then soap and water. See also our oil paints, oil brushes, and canvases.