Amerimax SeamerMate Gray Silicone Gutter Sealant 1 oz

This product can be used on new or existing gutter systems. On older gutters, remove any old sealant, dry the surface and sand it clean, then apply sealant; on new gutter installations, clean off any lubricants that were used in the fabrication of the gutter off surface to be sealed, to do this use soapy water or Windex and then lightly rough up the surface with sandpaper or wire brush, then apply sealant.