We recommend using a mechanical mixer. We sell an inexpensive mini mixer on our website that works great for our bottles. Here are my tips:• Use the split-stick attachment and
submerge the tip in the paint (our paint bottles are over-sized
to allow space for mixing)
• Or snip the end off of the whip attachment, leaving prongs about 1
1/8" long, pinch together to insert into bottle
• Add a few drops of Isopropyl alcohol to paint to enhance mixing
• Move attachment around inside of paint bottle (CAUTION: Spinning
the mixer too fast will result in paint flowing over the sides of the bottle.)