I have not bothered to seal any of the ones I've done installs with. But all the kicks I've installed have only contained mids and tweets. I do think they would need to be sealed if running a mid-bass. The weather stripping BOOSTEDGNs suggested should work to seal the edges that are against metal, but will not help on the bottom edges against the carpet. It would be better to seal against the metal in the kick panel, but you would need alot of buildup. Sorry, I don't seem to be much help on this one.