Wet Carpet

I had the same problem with my 70 Dart. New gasket, and sealant, but it would still leak a small amount in the bottom corner of the driver's side if I was driving it in rain. I added more sealant to that area and it seemed to stop.
What type of seaalnt? everywhere I went last year they sold me butyl rope caulk for windshields. Id love some squeeze in stuff from a tube.