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dcs-ny
AGG member
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Wed Jan 16th, 2008 03:37 pm |
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| I recently looked at newly restored windows (into the old frames) in our local church and noticed that they were not installed with putty, but something very shiny (black) and soft (resilient). Silicone came to mind first but it appeared too shiny and perfect. Some type of butyl tape material?? The same material was on the outside glazing ( seeming to be) holding the panels in the frame, over the entire area where putty would have been and it seemed to be sealed to the frames. (It was also applied atop the steel ventilator..almost tape like.... Of course i touched it, and it was solid yet resilient. There was a small 'extra' section that looked like very fine tape tail extending a minute bit past the metal of the ventilaor frame, which was soft. No, I did not pull it off. Does anyone know what that material might be? Have ever used it? Any thoughts or comments on this mystery material ( to me) would be appreciated.
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artfem
Administrator
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Posted: Wed Jan 16th, 2008 04:12 pm |
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dcs-ny
Thanks for the posting. If the material was exposed, it is probably caulk, silicone or a polyurethane. The caulk was probably tooled after application. Tooling is recommended when using caulk, not only for esthetic reasons, but because it ensures that the caulk will firmly come into contact with the substrates that it is intended to seal (in this case, the frame and the stained glass panel).
There are glazing tapes, but hese are typically used in an enclosed space, such as between the glass or stained glass panel and a frame, or inder an applied molding. Tapes should not be used for surface applications.
If the caulk is very shiny and very resilient, it is probably silicone, but I would have to see the caulk to be sure. An important consideration when using silicone with leaded or stained glass is that you use a neutral cure silicone. Silicone does not dry, it cures upon exposure to the moisture in the air. This curing process outgasses or relases one of two general classifications of compounds - alcohol or organic acids. If the silicone smells like vinegar while being applied, it is outgassing acetic acid. This acid will attack the lead resulting in a failed sealant bead and a structural weakening of the leaded window. Neutral cure silicone outgasses an alcohol, and this will not harm the lead.
I ofetn use silicone for setting windows in metal or stone. We also uise it in wood frames, but I have found that polyurethane caulk adheres a little better to wood. Before using caulk to set a window, I suggest speaking in depth with someone that understands how caulk is to be used. Some of the issues to underatnd are: certain substrates require a primer; the use of backer rod and/or bond-breaking tape; the relationship between the width and depth of a caulk bead; how to properly tool caulk; temperatrure range for caulk being considered; etc.
Good luck, and keep it off of your fingers, it is a bear to get off once cured.
Art Femenella
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dcs-ny
AGG member
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Wed Jan 16th, 2008 04:21 pm |
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| Thanks for your quick response. The installation was interesting, and with more background research on my part, per your recommendations, may be something to consider in certain situations . -dc
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artfem
Administrator
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Posted: Wed Jan 16th, 2008 10:45 pm |
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No problem
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kmassmann
AGG member
| Joined: | Sat Oct 28th, 2006 |
| Location: | Bethel, Ohio USA |
| Posts: | 1 |
| Status: |
Offline
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Wed Jan 30th, 2008 01:40 pm |
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It could have been the new "No Days Glaze". It fits inside the lead channel as you work, then you use a heat gun to cure it. It is supposed add strength and a good seal -- and is reworkable. Their website is . . . http://www.nodaysglaze.com.
I recently bought some for a cabinet door project, but haven't tried it yet.
Karen Massmann
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dcs-ny
AGG member
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Posted: Mon Feb 4th, 2008 04:01 am |
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I have the NDG in my studio and have tried it. It definitely was not that - Thanks for suggesting it. What I saw was sealing the panel into the frame and was present on the inside seal as well as the external side where the putty was. As Art F. indicated in his earlier comment, it was probably a silcone product.
style="BACKGROUND-COLOR: #222222"after you try the NDG, let us know what you think. perhaps others would be interested too. /Doris
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