The way I make the tools push paint around can cause the paint to dry quickly. By using a medium such as glazing liquid I could get a better flow but then it took longer to dry and was tacky feeling. Diluting with water made it wetter to manipulate yet it would dry faster without the tackiness. Although, when it was on top of the molding paste and my slick gessoed surface I was flipping paint all over the place.
The excess paint can also be wiped off when wet but it may leave the tool a little discolored. However, they don't have to be pristine to use. In fact, many times I would just pick one up with dried paint on it and use it just fine. Of course excessive rubbing or wetness might cause the dried paint to wear off onto the painting, which may or may not be desired.
I am super excited about using these tools. I believe they will become a major asset in the development of my work.