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Warning: I was using the same old caulk for years until a guy in Denver said something
I was grabbing a tube of the standard silicone I always use at the supply house, and this older installer next to me pointed at it and said, 'You know, that stuff will yellow on south-facing glass in about 18 months, right?'. He told me to switch to a specific UV-resistant polyurethane sealant for those jobs, and it completely changed how I think about long-term installs. What's your go-to sealant for big, sunny storefronts that has held up the best?
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seanlewis6mo ago
That "older installer" was spot on. I had the EXACT same thing happen with a big west-facing job. The regular stuff looked awful in under two years. My shop switched to using a specific UV-resistant polyurethane for any glass that gets a full day of sun. It costs more, but it hasn't yellowed or cracked on me yet, even after five Colorado summers. That advice saved me from some really ugly callbacks.
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williamt446mo ago
Yeah, @seanlewis is right... that UV resistance is key. We started testing a few brands by leaving samples on the shop's metal roof for a full summer before even offering it to clients. The difference in how they held up was shocking... some were completely chalked and brittle by August.
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