 the 
fat layer continued to cure, it would tend to cause the already dry lean layer 
above it to crack.</p>
<p>So, once you have decided on a basic approach, it is finally time to actually 
pick up the brush. Every artist has their own technique here, but the basic 
order of operations is usually similar.</p>
<p>The first step is to make sure the brush you are using is clean enough. I 
find a good wipe with a paper towel is often enough, but for a more thorough 
cleaning, you can swirl&nbsp; the br