As the name "mop" suggests, a mop brush is one that'll hold a large quantity of fluid paint. It's a soft and floppy brush, ideal for large watercolor washes.
Be sure to spend the time to clean it thoroughly when you're done painting; it's not a job to be rushed on a brush with this much hair!
Be sure to spend the time to clean it thoroughly when you're done painting; it's not a job to be rushed on a brush with this much hair!