A quality paint brush will have hairs that form a point and have a good spring to them - they bend while painting but return quickly to their original shape.
Hog hair is one of the most commonly using hair for paint brushes that are used for glass or ceramic painting. A good brush will also hold lots of paint and deliver that paint evenly throughout the stroke.
These brushes can be trimmed, used, and abused for years. Cheap brushes will normally be of poor quality and the painted result will reflect that fact. High quality brushes, when properly taken care of, will give you years of friendly use and be well worth the investment.
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