 allowing them to pick up and move thick 
paint easily. However, when you are trying to lay new paint on top of an 
existing layer of wet paint, you often want a softer brush that will not disturb 
the existing layers as much. Sable is one of the traditional choices here, but 
it is expensive, so synthetic sable substitutes are a good choice for this 
purpose.</p>
<p>A given brush company will offer a line of brushes in a given material of a 
given quality, and usually offer several sizes of each of 