Folk Art One Stroke

No, but once you use a brush enamel should be cleaned with paint thinner or turpentine, or you will not use it again. The enamels are very stable and does not wash with water because it is oil based and acrylic craft paint is water based, easy to cklean and is not permanent until 'to dry it.

Yes u do u dont want to use the same question Bursh spoil ur work so yeh u need different sets of Bursh

Yes. Use different brushes for each medium to prevent contamination.