I’ve actually wondered the same about marine-grade sealants. I used 3M 5200 on a deck project once, and that stuff’s basically permanent—almost too tough to ever remove if you need to redo anything. For windows, I’d be worried about making future repairs a nightmare. But with the salt air, maybe that’s what it takes.
I’ve found prep is where I cut corners and regret it later too. If there’s even a hint of old caulk or dust, nothing sticks for long. The windows facing the water get hammered way harder than the ones out back, which surprised me at first. Even with the pricier polyurethane, I still saw cracking after two years when I didn’t clean up properly.
The cost does sting, but honestly, it’s less hassle than scraping off failed sealant every spring. Still, I’m not sure if going full “marine” is worth it unless you’re right on the oceanfront or have zero overhangs.
Anybody tried using butyl tape instead of just caulk? I know some folks swear by it for RVs and boats but never see it mentioned for houses. Wondering if that holds up better in this kind of salty mess or just makes things messier…
Anybody tried using butyl tape instead of just caulk? I know some folks swear by it for RVs and boats but never see it mentioned for houses.
Tried butyl tape once on an old basement window—messy as anything, but it did keep the water out for a couple years. Main issue was dust and grit sticking to the exposed edges, so it looked pretty grimy fast. Not sure I’d use it again unless I had no other option.
Honestly, I’ve always been a little skeptical about butyl tape for house windows, especially near the ocean. I get why people use it on RVs and boats—those are moving targets with a ton of vibration and flexing, so you need something that stays sticky and flexible. But for a house? Especially somewhere salty and windy? That’s a whole different headache.
I tried butyl tape around a sliding glass door at our old beach place. It was a disaster after six months. The tape did keep water out, but every single speck of sand in the universe seemed to find its way to those sticky edges. Looked like someone glued a dirt mustache around the whole frame. Plus, the UV from the sun started to break it down, and then it got all gummy. Maybe it works better if you can hide it under trim or flashing, but exposed? Not worth it.
Honestly, high-quality caulk (like a good polyurethane or silicone) is less hassle in the long run. Yeah, you have to prep well and maybe redo it every few years, but at least it doesn’t turn into a lint trap. And if you’re really worried about air leaks—especially with those ocean gusts—a good backer rod plus caulk combo is hard to beat. I know some folks swear by butyl for initial installs, but as a fix or retrofit, it feels like more trouble than it’s worth.
Funny thing is, energy efficiency takes a real hit when those seals fail—even a tiny gap lets salty air in and drives up heating bills (plus everything starts corroding). Learned that the hard way after ignoring a failed seal for too long...not cheap to fix the rot either.
Curious if anyone’s had better luck with newer versions of butyl tape or some magic trick to keep it from collecting every bit of grime in town. Maybe there’s a secret I’m missing?
- Totally get what you’re saying about the sand—my cousin had a similar “dirt mustache” situation at his place in Cape Cod.
- I’ve read butyl does fine if it’s buried under trim, but out in the open? Sounds like it just becomes a grime magnet.
- Haven’t tried newer versions yet, but caulk seems less messy overall.
- Still, I do wonder if there’s some pro trick for keeping butyl clean...or maybe it’s just not worth the hassle by the ocean.
- The energy bills thing is real. Even a tiny gap and suddenly everything feels damp and salty.