When using Max CLR the directions for use on wood says that it be should be diluted 50:50 with acetone. It penetrates well and with a light sand between coats it looks professional. If bubbles form you can remove them and smooth the mug with a heat gun. It takes some practice to do this right though. The video’s creator is a skilled wood turner. You would need a lathe and a good amount of time to make these mugs. The mugs can handle hot liquids like coffee, but it’s probably best to hand not machine wash them.