Thinking how to seal block off plate . What do you think about this product?
https://www.homedepot.com/p/3M-12-fl-oz-Orange-Fire-Block-Foam-Aerosol-Can-FB-FOAM/207186372
https://www.homedepot.com/p/3M-12-fl-oz-Orange-Fire-Block-Foam-Aerosol-Can-FB-FOAM/207186372