indoor silicone sealant OK outdoors in the cold?

Old 11-22-22, 01:26 PM
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indoor silicone sealant OK outdoors in the cold?

I accidentally used silicone sealant marked for "indoors" to seal outside around the edges of the glass in my
roof skylight. I am worried it might cause problems in the cold Massachusetts winter; maybe expand and
crack the glass or at a minimum make the seal around the glass worse. I used TrueValue "Indoor
KItchen and Bath sealant. 100% Silicone" (Methyltriacetoxysilane) .
Will it be OK below freezing in the winter? If not, what might happen and how can I remove it?

I don't care about long term; I will replace the skylights in the spring.
BTW, What is the difference between silicone marked for indoor use and that marked for outdoor use?
Old 11-22-22, 01:51 PM
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Like interior paints, interior use silicone does not contain UV inhibitors, so it may not last as long as the outdoor variety.
Old 11-22-22, 02:23 PM
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Luckily silicone does really well in sunlight. The cold should not affect what you applied so I think you'll be OK until spring... 2030.

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