I usually tend to keep my brushes clean and looking new, but it's always good to have separate brushes for different foundations, don't you agree? (tlvbirdie.com)
I think Annie suggests using separate brushes... sometimes I'll use the same, though, washing thoroughly in between uses. (perfectlyimperfectblog.com)
I would definitely buy another Pac 286 brush as I like to keep separate brush for corrector and concealer. (beautyandblush.com)