WATER BRUSH VS REGULAR BRUSH
Water brushes are not a complete replacement for conventional brushes. They have their strengths and weaknesses, which make them ideal for various applications. In general, water brushes are easier to use from your home base, while conventional brushes can achieve a wider range of effects with more controlled use in water.

Water Brushes:    

No additional water is needed.
There are hats to protect the travel breasts.
Quick and easy to clean.
There are brushes that are always quite wet, which limits their ability to achieve the effects of dry brushing.
It can deliver large amounts of water as soon as the gun is pressed. Controlling the amount of water requires practice.
It may be easy to do small graduated washes, but flat washes and large washes are more difficult.
It comes in a limited number of many sizes.
Usually not expensive.

 

Regular Brushes:

Require separate water to use.

Caps are missing, so their breasts can be damaged when traveling.
Easily create wet and dry brushing effects.
Perform surface or step washes.
Available in many brush shapes and sizes. Available in multiple brush materials with larger springs and absorbency.
It comes in a wide price range.

 

Water Brush Tip Size
Water brushes come in a few basic sizes. Small (or “fine”), medium, and large brushes have round tips that taper to a point. Fine brushes release less water per stroke and are good for detail work, while large brushes can cover bigger areas quickly. Medium splits the difference between these two sizes, so it is the best all-purpose tip size if you are only going to get one brush.

Flat water brushes are not as good for laying down washes as flat regular brushes because they don’t get as big, but they are still helpful. In addition to making washes, they can produce different kinds of marks than you get from round brushes. They are especially good for painting straight, man-made objects, like buildings and lampposts.