Making Bubbles with your own Custom Brush

I really liked this tutorial.It will help me with my project because it will make the fat look hot because it will be bubbling. The bubbles look perfect because in my project the fat us supposed to start burning and then evaporate. The bubbling will make it look like if the fat was starting to boil. I really liked this because you could use it like if it was underwater or in the pool. It could help plenty of others projects. :)