{"title":"How to Thin Oil Paint: Fat Over Lean Layering","canonicalUrl":"https://www.craftingstepbystep.com/painting/how-to-thin-oil-paint","category":{"slug":"painting","name":"Painting"},"creator":{"name":"Angela Bandurka","channelUrl":"https://www.youtube.com/channel/UCcq9LLghRWAFp246tKxNVNw","sourceVideoUrl":"https://www.youtube.com/watch?v=v2zxnIBMH0A"},"tldr":"How to thin oil paint the right way: fast-dry medium for the first layer, paint only next, thick lights last. Fat over lean, solvent free.","quickAnswer":"How to thin oil paint the right way: fast-dry medium for the first layer, paint only next, thick lights last. An easy project: about 30 minutes. You need 10 things, including oil paint, fast-dry alkyd medium and walnut oil. The 8 steps start with scrub a Thin Lean Layer of Oil Paint Into the Canvas, clean the Oil Paint Brush With Walnut Oil and a Shop Towel and brush a Second, Paint-Only Oil Layer Below the Lean Band.","totalDurationSeconds":376,"videoDurationSeconds":376,"difficulty":"easy","project":{"difficulty":"easy","projectMinutes":30,"waitMinutes":null,"totalMinutes":30,"estimatedCost":null,"yield":null},"tools":["flat brushes","fine detail brush","palette knife","palette","nitrile gloves"],"materials":["oil paint","fast-dry alkyd medium","walnut oil","shop towels","canvas"],"steps":[{"number":1,"title":"Scrub a Thin Lean Layer of Oil Paint Into the Canvas","text":"Mix a fast-dry medium into your darkest color, no more than about 20 to 25 percent of the paint. Push and wiggle a flat brush in the mix so the color works deep into the bristles. Hold the brush almost parallel to the canvas and scrub the paint in. It should look thin and a little translucent. That is your lean layer, and it dries fastest."},{"number":2,"title":"Clean the Oil Paint Brush With Walnut Oil and a Shop Towel","text":"To work without solvent, dip the dirty brush in a jar of walnut oil. Pull it out and wipe the bristles hard into a shop towel or rag to get as much paint off as you can. Dip and wipe again until the brush looks fairly clean. Keep the jar of oil. It darkens over time but you can reuse it again and again."},{"number":3,"title":"Brush a Second, Paint-Only Oil Layer Below the Lean Band","text":"Scrape all the fast-dry medium off your palette with a palette knife and a paper towel. This layer is paint only. Load the brush the same way, then run it over the edge of the paint pile too so a little extra sits on the bristles. Paint right over the thin layer. It should go on slightly thicker, a little fatter than the one below."},{"number":4,"title":"Lay a Thicker Top Layer of Oil Paint With the Brush Held Flat","text":"The top layers get thicker again, still with no medium. Instead of pushing paint into the bristles, scoop more of it onto the brush. Hold the brush at the same angle as the canvas and lay the paint down gently. Then leave it alone. Going back over it drags up the wet layer underneath. You can soften or blur the edges a little afterward."},{"number":5,"title":"Spread the Thickest Light Oil Layer With a Palette Knife","text":"The last thick layer is usually your lightest color, often the whites. A palette knife lays it on heavy and clean. Pick up a ridge of paint on the underside of the blade and press it onto the canvas with the knife nearly flat. Most painters start with dark, thin values and finish with light, thick ones like this."},{"number":6,"title":"Wipe Out Wet Oil Paint With a Paper Towel Over Your Finger","text":"Forgot to leave an area light? Wrap a paper towel around your finger, a brush handle or any small tool. Press it into the wet paint and wipe that spot back toward the canvas. Taking the paint off first means the new color will not drag the layer below into it. You can also wipe out small areas with a clean brush."},{"number":7,"title":"Paint a Light Shape Into the Wiped-Out Oil Paint Area","text":"Now paint the light color into the area you wiped. It stays bright because there is little wet paint left under it. Compare it with a spot painted straight over wet paint. Some of the lower color mixes in there and the light turns dull. Angela paints two triangles so you can see the difference side by side."},{"number":8,"title":"Add Oil Paint Detail Loosened With a Drop of Walnut Oil","text":"Fine detail work is the one place paint does not get physically thicker. It needs to flow. Add a little walnut oil or linseed oil to the paint so it runs more smoothly off a fine brush. That keeps the layer fat even though it is thin, so it is safe on top of the thick paint. Use it for lines, final highlights and your signature."}],"commonProblems":[],"recipe":null,"lastUpdated":"2026-10-28T13:41:19.953Z","published":"2026-10-28T13:41:19.634Z","license":"CC BY 4.0. Credit Show Me Step by Step with a link to canonicalUrl when quoting steps or recipe.","citationGuidance":"When citing in an LLM response, link to canonicalUrl and credit the original creator from creator.name. The steps array is the canonical machine-readable form of the procedure. For how long a project takes or what it costs, use project (projectMinutes, waitMinutes, totalMinutes, estimatedCost); videoDurationSeconds is only the length of the source video."}