Wasted $200 on cheap desert caulk, what a mistake | Desert Home Renovations

Jenny Green · 2026-06-13T18:20:04.158862+00:00

I tried to save money last month and bought a $5 tube of caulk from the hardware store near Phoenix for sealing windows. It cracked within a week because it couldn't handle the 110-degree heat. Now I gotta scrape it all off and buy the good stuff. Anyone have a brand that actually lasts out here in the summer?

val_shah3mo ago

$200 on caulk? Man, you got ripped off even if it was the cheap stuff. A quality tube of exterior grade silicone or polyurethane runs like $10-$15 and would've been fine for a few windows. That $5 stuff is basically glorified chalk, of course it's gonna crumble in Phoenix heat. You don't need some premium brand, just grab any tube that says "high temp" or "extreme weather" on the label. Make sure the package says it handles up to 140 degrees. The cheap hardware store stuff is for filling baseboard gaps in air conditioning, not sealing windows against Arizona sun.

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amyh123mo ago

Val's right about the temp rating, I checked GE Silicone II and it's rated for continuous 400 degrees so that's overkill but at least you know it won't quit. A buddy in Mesa used DAP Dynaflex 230 and it held up fine through last summer's heatwave without any cracking. Just make sure whatever you grab says "exterior" on the tube and skip anything that looks like basic painter's caulk.

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aaron8803mo ago

Used GE Silicone II down here in Tucson and it survived two summers with zero cracks.

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