Brush Flush Paint Brush Cleaner

For oil painting, this product is superior to any other I've used over many years. Two things to bear in mind. 1) As w any fluid, if you let brushes soak in it too long -- more than a couple days, the bristles will eventually swell. Even for dried on oil paint, though, it isn't necessary to leave them in the cleaner for more than an hour or two 2) it's important to make sure every trace of the cleaner is rinsed out of the bristles before use. Not hard to do, but just be aware that if any trace remains it could affect performance and permanence of paint. For thicker brushes, if I think there's any chance that traces of cleaner remain, I dip the brush in turpentine thinner -- which I no longer use for anything else.