I’m familiar with kilz, I worked construction for 30+ years before my health went to hell.
I guess I didn’t really provide enough info. I didn’t mean just the small room has the musty smell, it’s in my entire garage (which is 30’x40’) so I don’t think doing anything to just the small room will really help, at least for very long. My roof was bad which caused some leaks but was reroofed a couple years ago and the smell is better but I don’t think it will ever go totally away short of me totally emptying and working on the whole thing (which will not be done until after I’m dead because my old crippled ass ain’t doin it) so I need to know if I can live with the smell, meaning it won’t affect my crop, or do I need to figure how to expand in my house, which is where I’m growing now.