I noticed my HVAC drip pan is get a little rust in the middle. Its
made out of galvanized sheet metal and looks like it custom made by
the HVAC installer. The rust spot in the middle is small, maybe 3
inches in diameter but I bet Im looking at $300 or more if I ever have
to replace the thing. I was thinking of pulling it out and soldering
over the spot where the zinc is gone or maybe just paint it with
rustoleum or something.
Rustoleum Hammerite paint is self-priming on steel and can be applied
to rusty surfaces as long as it's not loose rust. It needs a primer
on galvanized surfaces, but you're painting the rusty spot, so I
wouldn't worry about it sticking to the intact surface. The rust is
presumably starting at the low spot in the pan, so if you take care of
that, you won't have to worry about the rust spreading. If it does
happen to spread, just spray some more Hammerite on it.
Ive used JB weld to fix a car radiator , its lasted 4 years, paint
might not even stop rust from growing. How about a quart of silicone
tool handle coating, it would give a coat of rubber in 5 minutes work
to the whole tray.
The suggestion of a plastic pan is the way to go if you want to replace
it, but spraying the inside of such a steel pan with automobile
undercoating will protect it from rust for several years. This far more
effective than the zinc coating applied.
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