I use small (3 oz. / 2 in. high) paper cups to thin and mix paint for my 50 year old, siphon feed Paasche model H. I make a spout by pinching the paper cup to make pouring easier. I throw the cup away when after one or a few uses. I use wood dowels to stir paint in the bottle and in the cups. I just wipe the dowels off after using them.
