Most indoor painting is done with a roller. But corners and small details are painted with a brush. The type of brush used will affect the look of the painted finish.
Perhaps the most important difference between brushes and the affect they have on the final paint project. Thin bristles brushes will give a smoother coat of paint, but long bristles will not stay straight if they are too thin. So tapered bristled, which grow thinner near the tip, give the best of both worlds. Tapered bristles are sufficiently rigid while giving the smooth finish of thin bristle brushes.
Synthetic bristles are a more recent invention. They may be made of polyester and/or nylon, and are quite long lasting. They may also be tapered or completely straight. These synthetic brushes are preferred for water based paints as they do not expand when wet.
Natural bristles are preferred for oil based paints and varnishes. These natural material are not affected by the oil or thinner in the paint, and produce a smoother paint finish than almost any other brush.
There are different ways the bristles of a brush may be shaped. The more common varieties are:
Flat – A common variety. The bristles are arranged in a rectangular shape. This is used for most painting.
Tapered – The bristles are long in the centre and slightly tapers towards the edge. Many professional painters find this improves their control.
Angled –The bristles will slope from left to right of the brush. This is very useful for painting edges, which exist in all indoor painting situations.
Metric brushes vary between 10mm, 20mm, 40mm, 50mm up to 100 mm.
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