I notice companies like Winsor & Newton for instance sell both Drying Retarder & Slow Drying Medium, that retarder comes in gel form but slow drying medium is liquid and designed to be mixed in with water or other mediums in greater amounts. Having only used retarder I've been wondering if slow dry medium is worth trying, does anyone happen to have any experiences with it?
Also one more question please, do brush restorer fluids offer any advantage over the masters' brush soap? I've read somewhere they are good for dislodging paint in the ferrule which even brush soap won't affect but I'm yet to try some out.
Thanks guys.