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Old 05-22-2017, 08:23 PM   #4
rmr_69c10
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Join Date: Mar 2016
Location: Wylie, TX
Posts: 53
Re: Seam sealer for gutter?

Quote:
Originally Posted by 70STOVEBOLT View Post
3M 08307 is what I used for the horizontal. It was very easy to apply with a cheap manual gun I bought off eBay. The 3M 08308 is a different story. I used it on the vertical parts. It was much thicker and did not want to lay down smoothly. I used my dremel with a flap wheel to attempt to smooth it out but it left a lot of low spots that I had to fill in with a 2 part epoxy in a couple spots. The 3M stuff can be sanded in 15 minutes so it sets up fast. I laid down a tape line on the roof as a "stopping point". It worked ok. I don't have it completely smoothed out yet.
I'll second this, I used the 3M 08307 for the horizontal section as well and it worked pretty well. Be ready to remove the tape before it fully sets so you get a nice edge. I used a brushable sealer on the vertical sections. Not as smooth as I would have hoped, but I'll clean it up some before I paint it for good.
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