For years now I have been using the Robart paint shaker and found it to be rather inadequate for Vallejo paints, which has been a cause of a lot of frustrations. Then two weeks ago I came across a nail polish shaker that looked really promising. I figured I would give it a go and boy am I happy to have made the purchase. It's not cheap @ $100 but my wrists are well worth that price. The shaker is made by iZen and here is the link to the website where I purchased it from: http://www.proshaker.com/

Here is a link to a YouTube video demonstrating how the shaker work: https://www.youtube.com/watch?v=18KRbtpP-uQ.

The shaker housing is very sturdy and heavy (feels like cast iron). Operation is surprisingly quiet and I didn't have to make any modifications for the Vallejo paints. I took it out of the box, plugged it in and was off shaking my paints.

I highly recommend it.