So, I can tell you that you should not mix more than 30% water to your paint even if you’re using medium. Too much water will break down the binders in your paint. Here’s a tip for you to get started pretty cheap. Get some Elmer’s glue all and mix it with water at a 70% glue 30% water ratio. And then mix your paint in to that mixture. You want to use about 2 oz of that mix with 1 oz of paint. You can adjust that mixture by adding more paint or glue to make it thicker or a little more water to make it thinner. Mix it to your desired consistency. I could go on and on about this, but I won’t. Props on posting this vid.