Investing in a metal roof is a decision homeowners seldom regret. It's known for its durability and long life, and it holds up to the elements better than most roofing materials.
So, can you paint corrugated metal? You can coat it, yes. But "paint" isn't really the right word for what your roof needs. For a corrugated metal roof, sealing it is a better use of your time and money. It's no harder than painting, it lasts longer and it actually keeps water out. It all comes down to using the right products.
Paint for Corrugated Metal Roofs vs. Roof Sealant
When most people search for paint for a corrugated metal roof, what they really want is a roof that looks good and doesn't leak. Paint changes the color. A roof sealant changes the color and keeps the water out.
A Liquid Rubber sealant goes on like paint, with a brush, roller or sprayer. Once it dries, it forms a flexible, waterproof membrane over your roof. Here's what that gets you:
- It seals out water and helps protect against rust.
- It flexes as the metal expands and contracts with temperature changes, which helps minimize stress on your roof.
- Paired with Seam Tape and caulk, it seals the seams and cracks where leaks start.
Why Corrugated Metal Roofs Leak
Metal roofs can leak for a few reasons. The most common is loose or missing fasteners, often caused by heavy weather like windstorms, hail and snow. As the metal expands and contracts with weather and UV exposure, fasteners work themselves loose over time. Damaged trim pieces, gaps, large seams and rust can also lead to leaks.
Repair any damage before you seal your roof.
Choosing the Right Sealant for Your Roof
Liquid Rubber makes two sealants for metal roofs:
- MetalSafe Sealant is built for rust protection. It goes right over light surface rust with no primer and dries black.
- Color Roof Sealant is the pick when appearance matters. It comes in nine color options, including clear, so you can keep or change the look of your roof.
Searching for iron roof paint, or not sure what your roof is made of? Iron, tin, aluminum and other metals can look alike. If you're not sure what metal you have, or whether a product is compatible with it, reach out to our Product and Application Support Team before you start.
What You'll Need
- Power screwdriver with hex bits
- Power washer
- Brush, roller or sprayer
- Multipurpose Cleaner
- Sealant & Adhesive Caulk
- Seam Tape
- MetalSafe Sealant or Color Roof Sealant
- Water-based rust primer or converter, if you're using Color Roof Sealant on a roof with rust
How to Paint Corrugated Metal the Right Way: Step by Step
Here's how to "paint" your corrugated metal roof the right way: with a sealant.
Step 1: Inspect and Tighten Fasteners
Loose fasteners are the most common issue on any metal roof. Check every one. Tighten loose fasteners with your power screwdriver, and replace any that are missing.
Step 2: Clean the Roof
Power wash your roof to remove dirt, debris, rust and oils. For tougher grime, use Multipurpose Cleaner before you power wash. Then let the roof dry completely.
Step 3: Seal Seams and Cracks
Fill cracks and joints between 1/8 and 1/2 inch with Sealant & Adhesive Caulk. Smooth it out, remove the excess and let it cure for 24 hours.
If you're using Color Roof Sealant, prime any rust spots with a water-based rust primer or converter. MetalSafe doesn't need a primer over light rust.
Bridge larger cracks and seams with Seam Tape. Cut it to size, peel off the backing, then press and hold it in place for at least 30 seconds. Wait 30 to 60 minutes before you coat over it.
Step 4: Apply the Sealant
On a large corrugated roof, a sprayer is the most efficient way to apply sealant. You can rent or buy one at most home improvement stores. A brush or roller works too.
- Coat over all your Seam Tape and caulk, then apply an even coat over the entire roof.
- Let each coat dry before you apply the next one.
- Wondering how many coats? It depends. The best way to ensure you get the proper coverage is to get the full amount of sealant your project calls for and keep applying until it's gone (however many coats that is).
For dry times, coverage and weather tips, check out our full guide: How to Seal a Metal Roof.
Wrapping Up
Can you paint corrugated metal? Sure. But sealing it is the smarter move. It takes about the same effort, it lasts longer and it keeps your home dry, as long as you use the right products. The same approach works on other corrugated metal too, like sheds, siding and fences.
Ready to get started? Use our Metal Roof Kit Builder to get everything you need for your project. Have questions? Reach out to our Product and Application Support Team through our Contact Us page.
Corrugated Metal Roof FAQs
What's the best paint for a corrugated metal roof?
A roof sealant, not paint. MetalSafe Sealant is the best fit if your roof has rust. Color Roof Sealant is the best fit if you want a specific color or a clear finish. Both go on the same way paint does and waterproof your roof.
Can I choose a color for my corrugated metal roof?
Yes. Color Roof Sealant comes in nine color options, including clear. MetalSafe Sealant only comes in black.
What if I'm not sure what metal my roof is made of?
Reach out to our Product and Application Support Team. Iron, tin, aluminum and other metals can be hard to tell apart, and the team can help you choose a compatible product.
Can I seal a corrugated metal shed or siding the same way?
Yes. The same approach works on other corrugated metal, like sheds, siding and fences. If you're not sure which product fits your project, contact our Product and Application Support Team.
