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Old single pane House window has a crack, can I fix it using a resin? Sort of like how a windshield crack can be repaired with resin?

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I'm going to say no on this because of how a windshield is made. They are a layered construction with glass on the outside and a plastic material on the inside. A small crack or chip in a windshield doesn't cause a structural failure - the other layers hold the window together. Resin can be injected into the glass crack and pushed against the other layers with pressure to completely fill the crack.

On a single pane window, there is no backup. A crack means the glass is literally broken in half at that point and the crack will spread very easily. And pressure put on the glass to force the resin into the crack would probably be enough to make the crack expand across the glass.

If you were very careful, you may be able to just dab some resin on the surface of the crack and possibly reduce its visibility and give it a little extra strength, but it won't be the same fix as a car window.

  • I agree for a crack if it were a hole without a crack epoxy or silicon could fill it , my mom has a huge front window 6’x 10 or 12 wide very thick I has had a hole from back when the front was a lawn (lawn mower threw a rock) that hole has been patched for decades but a crack would be better to replace the glass. – Ed Beal Jan 20 at 16:23
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    I agree that cracks can't/shouldn't be fixed. Holes yes, especially BB holes (shouldn't have given me a BB gun for Christmas). Epoxy works well. These are relatively easy for a DIY project if they are at ground level or the putty in on the inside. – JACK Jan 20 at 16:54
  • @JACK Perhaps they shouldn't be fixed, but in a pinch it works better than nothing. Just consider it a temporary fix. – Mast Jan 21 at 12:12
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    @JACK You'll shoot your eye, er... window out! – FreeMan Jan 21 at 12:33
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I have had single pane glass replaced before typically it is quite affordable - I think last time my bill was $80. You just call glass people to do it.

Even if you could use a resin which I suspect you couldn't in an aesthetic way - it never looks as good and would be a lot of work.

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    Depending on the window and the age of the house, a lot of sins can be hidden by a fake stained glass or leadlight window applique. Basically a set of transparent stickers, UV resistant, that you cut to form a pleasing shape on the inside of the glass. Can be quite pleasing aesthetically. – Criggie Jan 21 at 1:13
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    Reglazing a wooden frame window is pretty straight forward for the home DIY and totally worth an attempt. Doing it in a metal frame is harder but possible. – Criggie Jan 21 at 1:14
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Replacing a single window pane in a multi-pane window sash in the window of an old house is not that hard. My friend taught me how to do it. In our old house the putty is mostly on the inside face of the window pane enclosure in the sash. You carefully take out the old window putty that is holding in the old, broken pane. Then (with gloves and safety glasses) take out the pieces of the broken pane. You will need the smallest tub of window putty the hardware store sells, a putty tool for doing window panes, and you will need to measure the opening in the sash. The hardware store can then cut you a new pane to measure, and sell you the glazing putty, the glazing points, and the putty knife and box cutter for maybe $30 - a lot less than $80. Here's a YouTube video on how to do it: https://www.youtube.com/watch?v=Dc67opK57sk

  • It can be a little bit tricky (and there's a chance you'll make another trip to the hardware for another piece of glass) but it's a skill that's pretty easy to learn, and if you live in a house with such windows, may come in handy many times in ensuing years. Once you have the tools and glazing compound, etc. the cost of the glass is probably around $5. – Greg Nickoloff Jan 24 at 20:57

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