If crawling around on a metal roof in the hot sun does.
Paint old metal roof.
Some old roofs have been found to have 30 40 layers of paint on them.
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The great majority of the time the roof will have a previous coating on it.
This is why when you are considering painting your metal roofing it makes sense to go for specific paints for the metal roof.
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When that much paint is present it may be time to replace the metal instead of painting it.
Apply the sherwin williams paint and primer to a galvanized roof with a paintbrush or a roller specifically designed for corrugated metal.
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Be extremely careful not to pierce the metal when scraping.
Try to achieve a slightly abraded texturized finish as this helps your new paint bond with the roof finish.
To paint a metal roof you ll need to use an oil based paint if you have a terne metal roof or an acrylic based paint if you have a galvanized metal roof.
Acrylic latex paint is a good choice for bare metal roofs and to go over old paint.
Water resistant metal roofing paint for example can be of great value if you live in a rainy area.
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Oil based alkyd paint may also be used with an appropriate galvanized metal primer.
You ll also need to purchase a primer designed for metal roofs.
It could even have multiple coats present.
If you re not sure what kind of roof you have ask a professional roofer to inspect it before you paint it.
Not using a sealant.
A topcoat doesn t eliminate the need for a good primer the topcoat seals your paint but the primer makes the paint adhere properly.
Although it isn t recommended to use a metal implement to scrape the roof it was the only way to remove the loose rust and old paint.
Also check in advance with your local authorities about any municipal regulations regarding scraping and repainting a metal roof.