I’m just back from my painting trip, so I’m here reporting back on the ‘smooshing brushes’!
I bought one in each size, small, medium and large. I bought them specifically to help me to with painting clouds. I actually used only the large brush. The small and medium size I felt were too small in this case to be useful for anything.
The large brush, - I liked a lot for use as a ‘dry brush’ - I painted in the clouds first using my regular brushes (a size 10 Rosemary short flat to be specific) then I used the large smooshing brush as a dry brush to create softer edges. It worked a treat!
I also tried using it as a wet brush, ie loading it with paint and trying to paint in the actual clouds with it. This did not work at all. The brush held way too much paint and behaved like a sort of mop.
I’d say these brushes are designed to be used dry to be effective (in my case at least).