Got Earplugs? in General Discussion Posted April 9, 2021 9 hours ago, SeaDawg said: Which butyl did you use, btw? And curious if you let it sit 24 hours before water test? I'm kind of disappointed that the butyl didn't work for you. We've never used it on something as heavy as an ac, so that could be an issue, for sure. Most of the weight sits on that 14 x 14 opening. But, you said your Dometic was install with butyl, right? I used a roll of butyl that I bought from RecPro when I bought the Houghton. I did let it sit for a few days before my first water test and all was fine. I did not bother to water test again after I tightened the bolts yesterday morning and more butyl oozed out (primarily from the areas around the bolts - the corners of the frame). I doubt it would have leaked but I lost faith and took the butyl out (patience is not a virtue for me 🙂 ). I'm wondering if I didn't have the urge to keep tightening the bolts if all would have been fine. When I took the Dometic off, I had to scrape butyl away so I thought that's all Oliver had used. However, once I had the unit down I saw that Oliver had used both a foam seal AND butyl tape. I thought that was overkill but whatever it takes to make the unit watertight I guess. I also remember thinking that the bolts securing the Dometic were just barely hand tight.