Opacity
If you lower the Opacity setting of the Paintbrush tool, you can paint across the image without worrying about overlapping your paint strokes (Figure 1.43). As long as you don't release the mouse button, the areas that you paint over multiple times won't get a second coat of paint.
Figure 1.43. A continuous stroke using the Paintbrush tool.
If you're not familiar with the concept of opaque versus transparent, take a look at Figures 1.44 and 1.45.
Figure 1.44. Opaque (left) versus transparent (right). (©2005 Stockbyte, www.stockbyte.com)
Figure 1.45. Varying opacity. (©2005 Stockbyte, www.stockbyte.com)
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