Different brush bristle types hold different amounts of water. Synthetics hold almost none, except what you can see. Badger holds a lot more in the bristles and releases it differently. Boar bristles are stiffer but can be spongelike, holding a lot but releasing it slower. Each bristle type, and in fact each brush, has different characteristics. Discovering them and perfecting their use is part of the fun. Load your badger brush with lather more fully with soap and with less later. You can always add water...hard to get rid of it!