This is an inexpensive means of keeping any number of brushes wet between sessions and while painting with water based paints. It can also be used for hanging brushes to dry tip downward.
Step 1: Materials needed
You will need:
1) A fairly deep square or rectangular water holder. I bought surplus motel 'ice buckets' at a kitchen supply store.
2) Pipe insulation - approximately 1.75 inch diameter with a 1 inch center hole. (From any hardware store) Other sizes will probably work.
3) Something for marking where to cut the insulation - chalk, pastel, paint, sharpie - you just have to be able to see the marks
4) An Exacto knife... this will need a fresh blade!