Ari B
2/12/2018

Hello there,
The metal roof on my house is showing a bunch of scratch marks and they look like rusty corrosion.
I would like to prevent these scratch marks from getting worse.
Is there anything I can do to remove the rust and paint the roof surface? What products do you recommend to use?

Please help me.
Ari

Todd Miller
Isaiah Industries, Inc.
2/12/2018

I would probably do your best to scrape away the rust without disturbing the surrounding paint. Apply a rust -inhibiting primer neatly then followed by the top coat.

Ari B
3/10/2018

Thanks Todd. I went to buy primer at a local paint store. They asked me if my roof is galvanized or metal. They said if it's galvanized, I won't be able to use oil based products on it. How do I tell if my roof is metal or galvanized?20180308_114018.jpg

Todd Miller
Isaiah Industries, Inc.
3/10/2018

No doubt the metal on your roof is either galvanized steel or galvalume steel. This metal has had its surface oil removed and been treated to accept paint, since the roof was already painted. I am more concerned about cleaning any existing corrosion than anything. You also need to be very careful to not "overdo" it with the paint as the new paint will fade more rapidly than the paint on the metal. Now, all that said, it's not at all unusual for touch-up to be water base and not oil base. Here's an article that may interest you: https://www.sherwin-williams.com/homeowners/ask-sherwin-williams/problem-solver/peeling-cracking/peeling-from-galvanized-metal

Ari B
3/11/2018

The scratches on the roof have been sanded and then washed.
They're ready to go for primer and paint. I have looked at a variety of products but I'm not sure if any of them can withstand the heat in the summer. What products (paint, primer) do you recommend to use?

Todd Miller
Isaiah Industries, Inc.
3/11/2018

Generally speaking I suggest going to a quality local paint store such as Sherwin Williams and using the system they suggest. However, if you'd like to go a step up, air-dry PVDF coatings are available from PPG Aquatec and also Tnemec. These will be very costly but offer better long term durability.

Ari B
3/11/2018

Thanks so much for your quick reply. I'll spend some time making the best choice I can.

Ari B
3/13/2018

Thank you. I decided to go with PPG Pit Tech primer and paint.

Ari B
3/13/2018

Are PPG aqua tec and pit tech same product? Pit tech is the only product available from PPG that I could find.

Todd Miller
Isaiah Industries, Inc.
3/13/2018

Pitt-Tech looks like a very good product for what you're doing. It does not appear to be the same chemistry as Aquatec. It looks like Aquatic appears to not be sold under the Kynar brand rather than PPG ... it is a very costly product though and perhaps not the easiest to get either ... https://www.kynaraquatec.com/en/

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