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Old 03-30-2010, 11:11 AM   #1
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Window Glazing question


I have re-done 3 windows by removing all of the glaze, priming and reglazing, and priming, and now paint (SW Super Paint in Super White).
I think I maybe doing more work than is necessary. What I have is (alligatoring) of some of the remaining windows. I have hairline cracks about every 1/4 to 1/2 inch. in the paint on the glaze, and it appears to be in the glaze as well. The glaze is not crumbling away, but with those cracks, what would you guy's do? Should I just remove the paint, then maybe heatgun the glaze to smooth out the cracks or remove all of it and replace with new?
I just don't want the paint to crack again, granted I don't think the paint that is on there now is a quality paint anyway. These are 6 & 8 panel double hung windows, and as you know, it is a lot of work to re-do all of them.

To keep things simple, if you have hairline cracks in the glaze do you replace or leave it?

Thanks for your suggestions and advice.

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Old 03-30-2010, 04:14 PM   #2
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Window Glazing question


why are you painting the glaze?

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Old 03-30-2010, 04:20 PM   #3
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Window Glazing question


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why are you painting the glaze?
I've never seen a window around these parts that didn't have the glaze painted.
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Old 03-30-2010, 04:22 PM   #4
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Window Glazing question


you need an oil primer. did you use one? and the glazing should be cured.
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Old 03-30-2010, 04:26 PM   #5
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Window Glazing question


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Originally Posted by Bob Mariani View Post
you need an oil primer. did you use one? and the glazing should be cured.
Yes, I used SW oil primer, then glazed, then primed again, and painted. I'm just curious as to whether or not I should remove the glazing that has hairline cracks on the remaining windows?
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Old 03-30-2010, 04:40 PM   #6
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Window Glazing question


you should be able to flatten them out. Maybe adding 50% penetrol to the paint.
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Old 03-31-2010, 12:24 AM   #7
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Window Glazing question


I am redoing my double hung windows and I have found them to be an incredible amount of work already - so if the glazing is intact, I leave it be. No sense making work when the old glaze may last another 30 years or more, or might even outlive the sash. THe way I see it, the sash will require routine maintenance/painting every 7 years or so, and I'll catch any problems on a future cycle. If I find cracking in the paint and the paint is still well adhered to the glaze, I just put a little glaze in the cracks, smooth it with my finger, give it a few days to set up, prime and paint it. I think of it as a realistic solution for a very minor issue.
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Old 03-31-2010, 12:42 PM   #8
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One more point about not removing all the glazing -- I have found on some of my windows that they were not bedded properly, or that the bedding has fallen away with time so the panes rattle a little, and that has made me want to remove all the glazing so I could re-sit the glass. What I do instead is place the sash glazing side down on sawhorses and with a very small cut in the tube, caulk around the edge of the glass with acrylic DAP. I let it set up for a bit, then flip it over and place missing points and the rest of the repairs. Doing this has created a great seal on windows where the glass wasn't sitting right, and is about 1/100 of the work of removing the glass to bed it properly with glazing.
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Old 03-31-2010, 01:44 PM   #9
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Window Glazing question


Are you talking specifically about the exterior putty? or the interior?

A good quality linseed oil putty should last a good twenty years and should be painted with an oil-based paint. If however a latex is used then the linseed oil putty has to be given plenty of time to dry out before painting. What type and brand of putty did you use?

Furthermore, the paint film should completely cover the putty and even a millimeter or so onto the glass to provide a barrier against air and water infiltration.
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Old 03-31-2010, 03:47 PM   #10
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I'm going to attempt to getting a couple of pic's on here, then you can see what I'm talking about.
This is taking the glazing knife and running it against the glass and glaze. Would you guy's remove all of it or just fill back in what has come out?











Attached Thumbnails
Window Glazing question-picture-018.jpg  

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Old 03-31-2010, 04:23 PM   #11
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The recommended method is to remove all the old glaze.

I scrape out all that is loose and can be reasonably removed, and glaze over whatever remains.

FYI - that is not alligatoring.
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Old 03-31-2010, 04:42 PM   #12
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you need to remove all the glazing
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Old 03-31-2010, 05:36 PM   #13
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Thanks guy's.\
I've already got the heat gun and glazing knife going
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Old 04-01-2010, 07:16 AM   #14
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Window Glazing question


Yeah...personally, I'm surprised you even had to ask.

No question. Just replace with a good putty. Then alkyd from a paint store, like BenjaminMoore or SherwinWilliams; this is tough work, so no time to cheap out - because you don't want to come back next year with
the same problems.
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Old 04-01-2010, 06:27 PM   #15
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Window Glazing question


Oil prime before and after.

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