Polyurethane does tend to hold up better over multiple winters, especially under harsher conditions—less cracking and shrinking compared to silicone. Application's a hassle, sure, but you'll thank yourself when you're not out there resealing in freezing weather. Good luck with it.
Yeah, polyurethane's definitely the way to go. Learned that the hard way after a brutal winter a few years back—silicone cracked like crazy, and I spent a miserable weekend scraping and resealing in freezing temps. Switched to polyurethane after that, and it's held up solid ever since. Application's messy, sure, but beats freezing your fingers off every other year...
Interesting point about polyurethane—I hadn't considered that. I'm gearing up for my first winter as a homeowner, and now you've got me wondering if my windows are sealed with silicone or polyurethane... How messy are we talking here? Like, tarp-the-whole-room messy or just keep-some-paper-towels-handy messy? Also, is there a noticeable difference in insulation, or is durability the main upside? Sorry for all the questions—just trying to avoid freezing weekends scraping cracked sealant myself!
Yeah, polyurethane can get a bit messy, but it's definitely not tarp-the-whole-room level. More like keep some paper towels and maybe a damp rag handy. Silicone is easier to work with, but I've noticed polyurethane holds up better over time, especially in colder climates. Insulation-wise, honestly, the difference isn't huge—it's mostly about durability and flexibility. I redid mine a couple winters ago, and the polyurethane still looks solid, no cracks or peeling yet... fingers crossed it stays that way.
I've done my share of window sealing jobs, and yeah, polyurethane is messy but manageable—just don't wear your favorite shirt. Silicone's definitely quicker to work with, but from what I've seen, poly holds up better in harsh winters. Had a client up in the mountains who insisted on silicone because it was easier... ended up redoing it two seasons later when it started peeling. Polyurethane on another job nearby still looks solid after four winters. Insulation-wise, agreed, not a huge difference; it's mostly about durability and handling temp swings without cracking. If you're dealing with serious cold or elevation, poly's probably worth the extra hassle. Just keep those paper towels handy—you'll thank yourself later.
Good points, but I've had a different experience:
- Used silicone on a cabin at 9,000 ft elevation, and it's held up fine for 5+ years—no peeling or cracking yet.
- Polyurethane might be tougher overall, but prep and application matter a lot. If the surface isn't spotless, poly can fail just as quickly.
- Silicone's flexibility has saved me headaches when dealing with older frames that shift slightly with temp swings.
Guess it depends on the specific conditions and how thorough you are with prep work...
Interesting take—your cabin project sounds like it's holding up nicely. Curious though, did you notice any difference in how well silicone handles extreme cold versus poly? I've had pretty good luck with silicone too, especially on older windows that tend to shift around a bit. But I did have one case at high altitude where silicone seemed to stiffen up more than usual in sub-zero temps...not sure if it was just the brand I used or what.
Totally agree about prep work though—it's surprising how often people overlook surface prep and then blame the sealant. Have you tried any hybrid sealants? I've heard some good things about them being flexible yet tougher than standard silicone, but haven't personally tested them out yet. Might be worth checking into for future projects, especially if you're dealing with shifting frames and harsh weather conditions.
"But I did have one case at high altitude where silicone seemed to stiffen up more than usual in sub-zero temps..."
I've noticed that too—silicone can get pretty rigid in extreme cold, depending on the formulation. Polyurethane usually handles temperature swings better, but it's a bit trickier to work with. Hybrid sealants might actually give you the best of both worlds; I've used them on mountain cabins and found they stay flexible longer and bond exceptionally well...definitely worth trying out next time you're dealing with shifting frames or harsh climates.
I've had mixed results with hybrids myself. Sure, they're supposed to combine the best features, but I've found some brands actually become brittle faster than expected in harsh conditions—maybe it depends heavily on brand quality or application method? Curious if you've noticed any difference in performance based on how well surfaces were prepped or cleaned beforehand...seems like that might affect longevity more than the sealant type itself.
"Curious if you've noticed any difference in performance based on how well surfaces were prepped or cleaned beforehand..."
That's a good point—I wonder if temperature during application could also play a role? I've noticed sealants applied in colder weather seem to fail sooner, regardless of brand quality. Anyone else experience that?