I’ve read on the forum that getting a fluid bed to “liquify” the powder has been problematic for some. I was one of them.

The problem was solved after a more precise air valve was installed. The standard ball valve type was not able to slowly and precisely adjust the air flow. I got a needle type valve and now the powder is expanding and it looks liquified.

This is the valve I bought, but it is a little large. In the future a smaller sized valve with a similar mechanism would be the preferred choice.

Amazon.com