Advice on painting chimney

ColdHouse · Post by **ColdHouse** » Sun. Jun. 19, 2022 1:50 pm

Hi,
I am going to be replacing my roof. I would like to paint this chimney that goes to my oil boiler. I would have to assume that it is galvanized. The metal seems solid so I would like to paint it. Any advice is appreciated.
Thanks!

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freetown fred · Post by **freetown fred** » Sun. Jun. 19, 2022 3:24 pm

I'm thinkin rustoleum will be your best bet.

Toddburn · Post by **Toddburn** » Sun. Jun. 19, 2022 8:02 pm

I swore by rust oleum professional it works great on steel sticks like glue however I painted my chicken coop roof it was newer galvanized and it’s peeling after one year. Your chimney looks like the paint should have something to grab to my coop roof was still shiny.

warminmn · Post by **warminmn** » Sun. Jun. 19, 2022 8:21 pm

Newer galvanized you have to scrub first with something. I think white vinegar works but not positive. Shiny galvanized the same thing.

Zinc oxide primer as an undercoating on regular paint might help it from rusting a little??? but no promises with coal plus its already rusted.

40 years ago I painted a small galvanized building roof and sides with some cheap paint and its still good. Wish I remembered what I used! lol

Retro_Origin · Post by **Retro_Origin** » Sun. Jun. 19, 2022 8:23 pm

Understand that galvanization is a zinc coating, that once stripped reveals the vulnerable metal. At this point you will need to determine whether things are too fargone. Also, sanding/disturbing/welding on galvanized metal requires adequate ventilation since it does release toxins (zinc is a low melting point metal that is not good to breathe) so you might not want to get crazy about sanding it. Not sure if the same paint will want to adhere to galvanization and slightly rusty steel, that's a question for the pros, but I painted my Jeep with rustoleum and a roller and it never peeled or chipped!

ColdHouse · Post by **ColdHouse** » Mon. Jun. 20, 2022 6:01 am

What about heat? Do you think the outside of that chimney gets too hot for ordinary paint?

Post by **coaledsweat** » Mon. Jun. 20, 2022 6:59 am

I don't think the top of the chimney will get to hot but good luck getting paint to stick to galvanized.

McGiever · Post by **McGiever** » Mon. Jun. 20, 2022 9:47 am

Scrub shiny galvanized surface with white vinegar before priming.
Rustoleum makes “rusted metal” primer made with fish oil, it is brownish. Also makes a clean metal primer it is grayish.

To avoid fading due to sun exposure look to outdoor paint with UV protection built in rather than generic paints that would fade in a couple seasons.

For rust removal I like a 4-1/2” right angle grinder with a cupped-knotted wire wheel brush.

freetown fred · Post by **freetown fred** » Mon. Jun. 20, 2022 5:04 pm

I would NOT go all nutzo on cleaning--I have used medium steel wool with satisfaction getting the worse of the rust off & then rustoleum--to much heavy-duty cleaning could make things worse!!

ColdHouse · Post by **ColdHouse** » Tue. Jul. 12, 2022 4:10 pm

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waytomany?s · Post by **waytomany?s** » Tue. Jul. 12, 2022 5:36 pm

Looks good!

nut · Post by **nut** » Tue. Jul. 12, 2022 7:12 pm

Latex is recommended for galvanized surfaces. Oil base peels.

waytomany?s · Post by **waytomany?s** » Tue. Jul. 12, 2022 7:58 pm

nut wrote: ↑
Tue. Jul. 12, 2022 7:12 pm
Latex is recommended for galvanized surfaces. Oil base peels.

Acrylic specifically. Depending on which Google listing you read.

ColdHouse · Post by **ColdHouse** » Wed. Jul. 13, 2022 4:10 am

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I used a Latex primer from Zinsser 123 and top coated with a rattle can or two of black.

nut · Post by **nut** » Wed. Jul. 13, 2022 7:09 am

ColdHouse wrote: ↑
Wed. Jul. 13, 2022 4:10 am
IMG_8002.jpegI used a Latex primer from Zinsser 123 and top coated with a rattle can or two of black.

That primer looks like a good one.