Instant Gutter Seal Gutter & Narrow Seam Sealant is a single-component, elastomeric, semi-self-leveling, high performance tripolymer sealant designed to prevent the passage of air and moisture through small joints or seams.
C**N
crap
Doesn't work
A**R
Too thick!
The material is too thick to work properly and because of flammability issues cannot be returned. I also ordered ISO's version of the same (gutter seal) which was far superior.