Experience using Duracoil to prevent evaporator coil corrosion on home AC?

Thanks for the suggestion, I will check with the manufacturer. Hadn’t even thought of the warranty issue.

He didn’t recommend the product, I was searching online for ways to protect coils and stumbled upon it.

But I had the same thought as to what would be “rusting”. Guess I need to check it out for myself. That was initially my plan, see if I could find what he was seeing, and while up there hit it with the coil stuff.

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because its copper or aluminum tubing, with stacked aluminum layers pressed onto it to make the fins but, and here is the rusty part, to give it extra strength and rigidity, its pressed into steel galvanized c-channel and then the end loops are soldered on to complete the assembly.

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Ahh, I see. So a little rust would be expected, but I should be concerned with excessive rust? So do you think this coil spray is worth a try, or is it just snake oil?

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Ahh, I see. So a little rust would be expected, but I should be concerned with excessive rust? So do you think this coil spray is worth a try, or is it just snake oil?

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yep, it doesnt really matter if the whole steel c-channel rusts through it doesnt hurt anything, its more or less there for support as the unit gets moved and jostled around in transit.

couldnt say if the coil spray is good or not but i will tell you the more you mess with an old system thats been sitting in one place for a long time, the higher the odds are you can cause issues by messing with it.

remember the golden rule, "if it aint broke dont fix it".

if you had a metal drain pan that was really bad rust then what i do for those is let it dry completely, then add plastic dip used for fishing nets and fill the pan to the top with that, then let it drain and dry. i follow that up with a second coat and then the pan is now good as new again and sealed by the plastic liner inside it. but as you can imagine thats only a last ditch effort used to avoid replacing the unit.