On Mar 25, 9:21 am, "Mike" wrote:
"marson" wrote in message

oups.com...

I'd recommend a one part urethane such as NP1.

I NPI a brand name or type of caulk?

NP1, not NPI. http://www.bestmaterials.com/detail.aspx?ID=10136

Make sure you clean the inside of that gutter perfectly and remove all
of the old caulking or you'll probably be doing it again before too
long.

R