Rocker makes a Silicone Glue Brush that retails for $5. This tool is designed to use with glue that can be peeled away when dried or washed easily in water.
When I saw it I thought it would be an amazing tool for Gelli-printing. The silicone bristles will push along the gelatin plate and remove or move paint which results in an interesting mark or pattern. The scraper on the other end will do the same.
Lastly, any acrylic paint that dries on the silicone can be pulled off easily to clean. Sounds like I will have to add it to my tool arsenal.