Learned this from a handyman years ago: To keep paint brushes from drying out: 1) wash out all the paint, 2) squeeze out excess water and 3) wrap in plastic wrap : r/lifehacks
How to Clean a Varnish Brush: 15 Steps (with Pictures) - wikiHow
CLING ON! ROUND BRUSH – Fusion Mineral Paint UK
DIY Make-up Brush Handles with Epoxy Clay - Resin Crafts Blog