In this case, it all starts with the right primer. The question is: what are the right materials to use? If we use the right supplies, we can ensure that our paint adheres properly and the rust never returns to our metal roof. The vinegar from the previous step should evaporate pretty quickly, so you won’t have to wait long before you can start applying your primer. It’s finally time to start watching the roof change. You don’t have to scrub hard, just lightly apply the vinegar to the entire roof. We’re going to use white vinegar since it’s completely natural, inexpensive, easy to find, and completely harmless to you.Īpply some of the white vinegar to a rag. So, we need to neutralize the zinc with an acid. Wipe the Roof Down With Vinegarīecause corrugated metal roofs are made with a galvanized coating to prevent corrosion, the paint is going to need some help if we want it to stick. You can just let the chemicals and machines do all the work. With this method, you likely won’t need to scrub by hand at all. Then, turn the pressure washer up to a minimum of 2500 PSI and start spraying off the rust and discoloration. If you have access to a pressure washer and don’t mind using the harsh chemicals, combining these methods can give you the best results.įirst, apply the trisodium phosphate to the roof and give it about 15 minutes to soak in and start loosening up the rust. Though pressure washers and trisodium phosphate are both effective for removing rust and stains from your roof, their effectiveness can be compounded when you use them together. Make sure to hit the entire roof, knocking loose any flakes of rust, and spraying off as much of the oxidation coloration as possible. Simply turn up the pressure and start spraying. You’ll need a pressure washer to make this work, and it needs to reach at least 2500 PSI if you want to remove the rust from your metal roof. Method 2: Pressure Washer If you don’t want to scrub by hand or you’d rather not expose yourself to the harsh trisodium phosphate, then you can opt for the mechanical method instead. Then, using a hard-bristled scrub brush, scrub all of the rust and remove as much of the staining as possible. Give it a good 15 minutes to penetrate the rust and start working. Once mixed, you’ll need to apply it to any rusty areas using a sprayer. It comes in a powdered form but will need to be mixed with water at a ratio of one cup trisodium phosphate to one gallon of water. You’ll need to dilute the trisodium phosphate before applying it.
Make sure to wear rubber gloves and clothes that you’re concerned with getting destroyed, just in case. It’s a harsh chemical that’s very effective at what it does, but you don’t want to get it on your skin, clothes, eyes, or anywhere else. It’s a common chemical that you can find at most local home improvement stores.Ī word of caution: be careful when using trisodium phosphate. can penetrate the rust and help to remove stains and prevent the rust from continuing to grow.
Method 1: Trisodium Phosphate No products found. The first method is going to utilize chemicals to attempt to neutralize the rust and weaken it so that you can then remove it with a scrub brush.įor the second method, you’ll need to employ the help of a pressure washer.īefore attempting either method, ensure that you’ve removed the largest flakes of rust from your roof with a dry scrub brush. To do this, there are two major methods you could employ. Removing the rust from your metal roof is going to take some physical work. You’re going to need to follow the same basic steps: preparation, primer, paint. Painting a metal roof isn’t much different from painting any other metal surface. Once coated with the rust killer, the oxidation will no longer be able to grow and weaken your roof. To take care of the first step, removing the rust, we’re going to need to physically attack the rust and remove as much of it as possible by force.įor halting the rust in its tracks and ensuring that it won’t continue to eat through our new coating and degrade the existing metal any further, we’re going to use a special primer with a rust killer built-in. Next, we need to prevent the corrosion from continuing to expand. Before we can even think about painting, we’re going to have to do something about that rust.įirst, we need to remove as much of that rust as possible. Well, you can but it’s going to take a few more steps than just painting it and calling it a day. The obvious first question is: can you paint over a rusted metal roof? It would be extremely convenient if all you had to do was slap a new coat of paint onto that aging, corroded old roof. Can You Paint Over a Rusted Metal Roof?.
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