Just wet the brush and work up a lather on the hard cake. Even old, hardened oil paint brushes can be restored to their original snap and luster.
Brush Cleaner and Preserver works on most acrylics and watercolours, too.
It gives off no harmful fumes or odors, and it's safe for use in the home, classroom or studio.
I was introduced to this in the US whilst in an art shop. Although sceptical on how much better this could be vs washing detergent, it really does make a huge difference. Removes more paint and conditions brushes really well. Just wish it was available in bigger sizes as I'm now likely to get through tons of this stuff! Jan Lewis (Royston, United Kingdom) on 12 Jan 2015
I have a number of quite old and dry brushes. I used this after giving the Zest-it a try, and now have brushes which have taken on a new lease of life. It will save me a fortune on buying new brushes! Penelope Anderton (Panton, Lugo, Galicia, Spain) on 17 Jul 2013
I'd say its quite necessary if you buy those expensive kolinsky brushes, it will allow your brushes to serve you for a VERY long time, but at the same time it will bring back your old ones! Zilvinas (Lithuania) on 16 Sep 2015