UniBond 2079110 Roof & Gutter Sealant, Long-Lasting Butyl

A couple of years ago I purchased and installed a nice patio cover at the back of my house, but I had to modify the supplied gutter to fit a restrictive space. I sealed the new joint with a product designed to weather seal motorhomes and caravans, but this week I noticed a slight leak at the joint and it was soon apparent that the sealant I used had gone hard and brittle and failed.
I bought this Unibond sealant, with the expectation that it would remain flexible and therefore not harden and crack in the same way.
As others have commented, there was a small amount of the product in the tube the wrong side of the inner piston, but the tube still appeared to be pretty full. I cleaned off this excess product before placing in a gun, then prepared the surfaces as directed. I applied masking tape to create a neat joint then started to apply it carefully. Although it’s of a fairly thin consistency, I found obtaining a neat result quite straightforward and it required very little tooling to get a great finish. It really does stick well, including to any tools you might have used. I also found that more of the product had seeped the wrong way down the tube and had made a bit of a mess inside my gun. The instructions say to remove unwanted product with white spirits, but I found that WD40 works just as well.
24 hours later and the heavens have opened and it’s chucking it down, but my guttering is now perfect so this stuff has worked exactly as intended. OK, it’s a bit messy and required some extra care but for me it worked just great so it was well worth the extra effort.
I hope you find my review helpful