Could this be used with acrylic paint
You can use any brush with any medium as long as they offer you effect you are looking for.
I have often used the SAA Silver range for painting with acrylics.
The SAA silver Rakes are made with two different lengths of synthetic brush hair to create a range of clever effects including grasses, fur and general hair effects.
They should work with Acrylic paint but bearing mind that acrylics are much heavier than watercolours so the effects may not be as obvious.