If your rain gutters leak at the seams and you’ve already tried caulking them, use rubberized spray paint. Make sure the gutter is dry, and spray the inside of the gutter all around the seam. Go about 6 in. from the seam on each side to get good coverage. Rubberized spray paint is sold in standard-size cans as an undercoating for cars, and it’s available in the auto-body section of automotivesupply stores.
Jim Borson, Duluth, MN
From Fine Homebuilding 194, pp. 32
March 4, 2008