Foam materials

Hi, I am not very skilled with visualize.  I just wanted to get that out of the way...  I am using visualize 2018 and I am trying to get a foam texture like the one attached but I'm having a very difficult time.  I can apply appearances and put a foam texture on it but it doesn't appear correctly at all, at least its not what I am trying to achieve.  I am using the cloud appearances and textures and I have been experimenting with the solid checkbox in the appearances\general tab to try and make them transparent but that is not working.  Am I on the right track at all?  Any help?