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Caulking around copper pipe

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  • Caulking around copper pipe

    On Sunday I used some DAP Acrylic Latex Caulk Plus Silicone and sealed minor gaps (1/8") around the 1" water pipe where it came out of the wall in the garage. Today I found the clear caulk mostly hardened, but the pipe where the caulk touched turned green.

    I understand that this may be due to oxidation. I wonder if I need to worry about possible corrosion which might weaken the pipe.

    Any comment would be appreciated.