Gutters leak when the EPDM Seal degrades from exposure to the elements. Silicone
are often used to repair the seal, but the surface has to be dry first. Solvents within
the sealant will evaporate causing it to shrink and collapse on the seal/bond line
resulting in failure. OB1 performs flawlessly even when applied under
doesn't contain solvents, so therefore will never shrink or crack. It's the perfect
repair for leaking gutters.