I would suggest you speak with a flooring specialist regarding any type of sealant on concrete before glue. I work at a store that sells flooring and installs. Since I don't deal with the installation process at all, I don't want to give you absolute advice on my own. However, I will tell you that we are doing a job in a large church addition with a large area of ceramic tile. The church had already used a sealant on the concrete which they had to have removed because the adhesive would not stick to the sealant. I understand your concern of sealing off asbestos dust. But, most adhesives will not adhere to sealants. Please check with a professional installer before using a sealant. Go to a flooring store, not a typical builder center. Builder centers normally contract out their installations and may not have the expert advice you need.
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