Introduction To Oil Brushes
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Why: Oil painting is rarely done with your wrist resting on the table (like writing). It is done standing at an easel.
The Grip: You hold the brush near the end of the handle, not near the metal ferrule. The long handle balances the weight of the head.
The Result: This allows you to paint with your shoulder and elbow, creating loose, energetic strokes rather than tight, stiff doodles.
Oil paint is heavy. It often contains dense metals like lead or cadmiums as well as thick oil. A soft watercolor brush will just flop over if you try to push oil paint with it. You need muscle.
1. Natural Hog Bristle
The Material: Hair from pigs (Chunking Bristle).
The Feature: Look closely at the tip—the hairs have "split ends" (flags). These splits grab the oily paint and hold it.
The "Interlocked" Secret: Good hog brushes are built with the hairs curving inward toward the center. This keeps the brush shape tight even when wet. Cheap brushes splay out like a bad broom.
Best For: Impasto, underpainting, and texture. If you want to see the brushstrokes in the paint, use hog.
2. Natural Sable / Mongoose
The Material: Soft fur (Red sable).
The Feature: Zero stiffness. It feels like silk.
Best For: Realism and glazing. When you want to paint a portrait smooth as glass, or blend a sky so perfectly that the brushstrokes disappear, you switch to sable.
Warning: Do not use these for the first layer. The canvas weave will ruin the soft hairs. Only use them on top of other paint.
3. Stiff Synthetics
The Tech: "Interlocked" synthetic fibers.
Why: Real hog bristle gets soggy after 1 hour in paint thinner. Synthetics stay stiff forever. They are also easier to clean.
Verdict: Many pros have switched to synthetic brushes because they last 3x longer than natural hair.
Profile: A cylindrical ferrule with bristles that taper to a fine or blunt point.
The go-to brush for initial sketching and underdrawing on the canvas. It is also the primary tool for fine details, delicate line work, and adding precise final highlights.
Profile: A flattened ferrule with medium-to-long bristles cut perfectly straight across.
Perfect for blocking in large areas of color quickly. The flat belly holds a good amount of paint, and the chiseled tip can be turned sideways to cut crisp, straight lines or architectural edges.
Profile: Flattened ferrule with a straight edge, but the bristles are much shorter than a flat (typically as wide as they are long).
The short bristles provide intense stiffness and resistance. It is the ideal brush for driving thick, heavy impasto paint onto the canvas and leaving distinct, aggressive brushstrokes.
Profile: Flattened ferrule with bristles cut into a rounded, oval shape at the tip.
The absolute favorite for many portrait and figure painters. It provides the wide coverage of a flat brush but lacks the sharp corners, allowing for seamless, soft-edged blending of skin tones and organic shapes.
Profile: Flat ferrule with bristles spread outward into a wide, flat semicircle.
Primarily a blending and special-effects tool. Oil painters use it with a light touch to "knock down" or blur harsh brushstrokes, create smooth gradients in skies, or stipple textures like distant foliage and fur.
Profile: A flattened ferrule with a rounded tip, exactly like a filbert, but the bristles are longer.
A historic, classical brush unique to oil painting. The extra length allows it to hold a massive amount of paint and flex dramatically, making it perfect for loose, highly expressive, painterly strokes.
The Best Starter Kit:
Robert Simmons Signet (Filberts #4, #6, #8).
Why: They are virtually indestructible. As a beginner, you will likely abuse your brushes (scrubbing too hard). These can take the beating and still perform.
The Pro Upgrade:
Princeton Aspen Series.
Why: If you dislike the "scratchy" feel of natural hog hair, these offer the stiffness you need with a smoother application.
Maintenance advice:
Oil dries by oxidation (chemical reaction), not evaporation.
The Danger: If oil paint dries in the ferrule, the brush is dead. No amount of water will fix it.
The Routine:
Wipe excess paint on a rag.
Rinse in Gamsol (or mineral spirits) until clear.
Use The Masters Brush Soap and warm water in your palm until the suds are white.
Use your fingers to shape the wet bristles back into shape before letting them dry.