Last year I had a chance to see how in reality mast hound is fixed to the mast wall from the inside. Here is is the picture:
Before I enter the hound into the mast I apply 6 layers of glass biaxial 300g/m2. The purpose is to fill the gap between inner mast wall and hound. The result as you see is perfect. There are no air pockets and fit is as expected.
And this is how mast hound looks like prepared to receive glass and resin.
I will make a separate post on how to install a hound step by step.