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Blue stuff sprayed on condenser coil


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Does anyone know what this blue stuff on the coil is? It's like a thin coat of paint. I don't have a closeup picture. It's a Carrier and the data plate is missing, but it looks to be a good 20 years old. Being A/C only, it was way too cold today to operate the system.

The outside unit was wrapped in a tarp. The buyer said it wasn't covered when he saw it a week ago. I normally don't uncover them, but that made me a bit suspicious.

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