My 80s windows are letting in a chilly breeze again, and the old caulk is cracking. I’ve tried a couple brands but they either shrink or get all gummy. Anyone got a go-to that actually lasts through winter?
I swear, old windows have a sixth sense for when the weather turns nasty. Mine are from ‘85 and I always get that little arctic blast right at ankle level. I’ve been through my share of caulk brands over the years, and honestly, half of them seem to either crack up in the cold or turn into sticky goo when it warms up. Ever tried the silicone-based stuff? I was skeptical at first because it’s a pain to clean up, but it actually held up better than the acrylic ones last winter. The only thing is, it smells a bit while curing and you need to wait a day or so before painting over it—kind of annoying if you’re impatient like me.
Did you ever use one of those “window insulation kits” with the plastic film and hair dryer trick? Not exactly caulk, but I slapped one on my draftiest window last January and was surprised how much it helped. I guess it’s a bandaid, but sometimes a bandaid is all you need to get through the season.
Curious—are your frames wood or metal? I noticed the caulk seems to fail faster on my old aluminum frames, maybe from all the expansion and contraction. My neighbor swears by this “Big Stretch” brand (silly name, but whatever), says it flexes more and doesn’t crack as fast. I haven’t tried it yet, though.
Anyway, I totally get the frustration. Feels like you fix one spot and another starts leaking. Has anyone else found a magic bullet for this, or are we all just chasing drafts every year?
I hear you on the old windows—mine are from the late 70s, and I swear they let in more wind than my actual front door. I’ve tried silicone too, and yeah, it’s a mess to work with but it does seem to last longer. The plastic film kits are my go-to for the worst offenders. Not pretty, but my ankles appreciate it. My frames are wood, and I still get cracking, so I’m not convinced it’s just an aluminum thing. Never tried Big Stretch, but the name cracks me up every time I see it at the store... might have to give it a shot next round.
The struggle with old wooden frames is real—I’ve got a 60s ranch and the draft situation is basically a year-round project. I agree, silicone is tough to work with; I always end up with it everywhere but where I want it. For wood, have you tried using a backer rod before caulking? It helps fill larger gaps and stops the caulk from cracking as much over time. Big Stretch actually does live up to its name in my experience, especially where there’s movement from temperature swings. It’s not a miracle, but I haven’t had to redo it every season like with some others. Curious if your frames are painted or natural—sometimes the finish changes how well anything sticks.
Painted frames, yeah. I hear you on the backer rod—used it a couple years ago on a gap that was basically a canyon. Made a difference, but I still ended up with some cracking where the wood flexes. Tried Big Stretch once, but maybe I rushed it because it peeled in spots. Might give it another shot, this time with more patience and less freezing temps. Silicone was a smeary mess for me too. Funny how fixing drafts is never just “caulk and done” with these old windows…
Big Stretch actually peeled for you? That’s wild—I always hear folks swear by it for old woodwork. Did you prime the spot first, or just slap it on bare wood? I’ve had caulk fail when I skipped primer, especially on spots that get a lot of sun or flex a bunch with temp swings.
Have you ever tried one of those hybrid caulks, like the polyurethane ones? The stuff is a pain to tool and clean up, but I used it last year on a door frame and it hasn’t budged, even with the wood moving around all winter. Downside: it stinks and takes forever to cure. Curious if anyone’s managed to get a clean bead with that stuff around windows, though... seems like overkill but maybe worth it if nothing else holds up.
Are you painting over your caulk, or leaving it exposed? I always wonder if paint helps seal the deal or just hides problems until they get worse.
Priming’s key if you’re caulking bare wood, especially outdoors or spots that flex. I’ve seen even the “stretchy” stuff peel if it goes on raw—paint or primer gives it something to grip. Polyurethane caulk is tough as nails, but yeah, it’s a bear to tool and cleanup is rough. I’ve managed a decent bead on windows by taping both sides, but you gotta pull the tape before it skins over or it gets ugly fast.
Always paint over caulk if it’s exposed. Paint helps seal the edges and keeps UV from breaking it down so fast. Unpainted caulk tends to crack and peel sooner, at least in my experience.
I’ve had the best luck with hybrid caulks—those siliconized acrylics seem to hold up well through Midwest winters, and they’re way easier to clean up than pure polyurethane. Curious if anyone’s tried those newer “elastomeric” formulas on old wood sashes? Wondering about real-world longevity.
I’ve actually tried a couple elastomeric caulks on my 1920s double-hung windows, and I’ll say they’re definitely more flexible than the old latex stuff. The main thing I noticed is how they handle the expansion and contraction of wood—especially after a few freeze-thaw cycles. The elastomeric didn’t crack or separate like some acrylics I’ve used, but it did pick up a bit of dirt and yellowing after a year or two. Cleanup is a pain if you get sloppy, though.
One thing that surprised me: they’re not as “paintable” as advertised. I had to wait longer than expected for the caulk to cure before painting, and even then, some paints didn’t take as well. On the plus side, drafts were basically gone all winter. No noticeable shrinkage, even on the sashes that see direct sun.
If you’re after longevity, elastomerics seem solid, but they’re not totally maintenance-free... I’ll probably have to touch up a few spots this summer. Anyone else notice that with these newer formulas?
they’re not as “paintable” as advertised. I had to wait longer than expected for the caulk to cure before painting, and even then, some paints didn’t take as well.
That’s been my gripe too—elastomerics do a great job sealing, but the paint thing’s a headache. I’ve had better luck with the “paintable in 30 minutes” acrylics, but they don’t flex as well when the wood moves. For old windows, I usually go elastomeric outside and an acrylic inside for easier touch-ups. Still, nothing seems totally maintenance-free, especially on south-facing sashes.