Flat foundation brush

A flat foundation brush is shaped like a painter’s brush: a flat, fairly firm head of smooth synthetic fibre, a few millimetres thick, gathered in a flattened metal collar and rounded or tapered at the tip. It is used the way a painter uses one, laying foundation on in strokes. That makes it the most precise way to place a liquid, and one of the thinnest: it spreads a little a long way, and its edge reaches the corners of the nose and the lash line where a round brush cannot.

Its weakness is the stroke itself. A paddle can leave faint lines, which is why its work is often finished with a damp sponge or a buffing brush. A flat-top buffing brush, dense and cut straight across, gives fuller coverage with no streaks but uses more product; a stippling brush gives a sheerer, airier finish. The paddle is the tool for a thin, controlled layer, and for anyone who likes to see where the foundation is going.

Three things vary. The edge may be rounded like a fingertip, tapered towards a point, or shaped like a cat’s tongue, as Dior describes its N°11; the rounder the edge, the softer the line it leaves, and the more pointed, the better it reaches around the nose. Firmness decides coverage: a firm, dense paddle pushes more foundation onto the skin, a softer one lays a sheer coat. Size should suit the face and the job: a broad paddle is quick over the cheeks and forehead, a small one doubles as a concealer brush. Look at the ferrule, too: on a well-made paddle the flattened metal collar is crimped tight, so the head neither wobbles nor sheds as it paints.

Choose synthetic fibre for liquids. Hair is porous and drinks foundation, which wastes it and clogs the brush;^[1] a smooth synthetic paddle slides. Hakuhodo, which works in both hair and synthetic fibre in Kumano, sells its foundation brushes in synthetic on exactly that point: one of them, it says, “does not absorb much liquid”, so it glides and spreads foundation without losing coverage.

Put a little foundation on the back of your hand rather than on the brush, and pick it up on both sides of the tip. Start at the centre of the face and paint outward in short strokes, thinning as you go towards the hairline and jaw. Use the flat for the cheeks and forehead and the edge for the sides of the nose, the lids and the corners of the mouth. Add a second thin coat only where the first did not cover.

The paddle suits some formulas better than others. Thin and medium liquids, serum foundations and tinted moisturisers spread furthest under it; a thick cream or a stick needs a firmer, denser paddle, or warming on the back of the hand first. Fast-setting long-wear foundations need speed, so paint one area at a time and blend it before moving on. The same brush lays down primer, and some makers sell theirs for moisturiser and face masks as well.

Then finish. Pat over the face with a damp sponge, or buff lightly with a dense brush, to melt any strokes; or press the flat of the paddle against the skin, which smooths as it goes. Wash the brush after every use: foundation left to dry in a flat head spreads it into a fan that will never paint a clean line again.

The paddle is the foundation brush that stayed closest to its origins, because it is a painter’s brush. The Getty’s art vocabulary defines the filbert as a flat artists’ brush with rounded corners,^[2] and Cinema Secrets still sells its paddle as a “flat filbert”. When Hakuhodo, in the Japanese brush town of Kumano, began developing makeup brushes around 1980, the makeup brushes on sale, by its account, were modelled on Western paint brushes: good on a flat surface, less suited to the curves of a face, and often packed free with a foundation or an eyeshadow.^[3]

A Western brush of this kind is built in three parts. The fibres are gathered into a bundle and their root ends are glued, in one maker’s description with epoxy, into a “bristle knot” inside a metal ferrule, which is then crimped or glued onto the handle.^[4] The ferrule also sets the shape: a patent application published in 2004 in the name of Paula Dorf describes crimping it to force the fibres into a semicircle, an oval or a rectangle,^[5] and a patent filed in 2019 describes a foundation brush as a flat head with a partly semicircular edge.^[6] Pinch a round ferrule flat, and a round bundle becomes a paddle.

The traditional Kumano method is slower, and done by hand. The hair is sorted and weighed, tangled hairs are lifted out one by one with a small knife, hairs cut to different lengths are mixed in thin layers, and the bundle is tied at its base with hemp thread and sealed with heat before it is glued into the handle.^[7] Hakuhodo, which adapted these techniques for its makeup brushes, told Nippon.com that a typical makeup-brush process has seven stages, and that it divides its own into eighty.^[3]