Does anyone have experience with Vallejo's Brush Restorer? The bottle says to put the brush in for a few minutes, however that does not seem to have done anything for any of my brushes, even the relatively new/clean ones.
I found one blog that puts them in for many hours, is that safe? Am I doing something wrong? Do I have a "bad" copy?
https://www.coloureddust.com.pl/2015/09/how-to-use-vallejo-brush-restorer.html