Acrylic roof coatings are designed to protect roofing surfaces by creating a reflective, waterproof layer that helps extend the roof’s lifespan. However, rusting can become an issue, especially on metal roofs underneath the coating. Rust forms when moisture gets trapped between the roof surface and the coating or if the coating is applied over an inadequately prepared surface with existing corrosion. This can happen because acrylic coatings are water-resistant but not entirely waterproof if applied incorrectly or if they develop cracks or blisters over time. Simple diagnostics include visually checking for any bubbling, peeling, or discoloration in the coating. You can gently press around these spots to see if the roof surface underneath feels soft, which can indicate rust damage. Doing this safely means using a sturdy ladder and wearing gloves to avoid sharp rust edges and using a flashlight to inspect dark or hard-to-see areas.
For most homeowners, tackling rust under an acrylic roof coating is not a simple DIY fix because it involves removing the damaged coating, treating the rust, and properly reapplying the coating to ensure a smooth seal. Calling a professional roofer is the safest option if you notice escaping bubbles, flaking, or persistent moisture signs. When contacting a contractor, ask them how they assess the extent of rust damage under the coating and what methods they use to remove rust without harming the roof. Also, inquire about their experience with the specific brand of acrylic coatings on your roof to ensure warranty compliance and proper application techniques. These questions help you gauge whether the roofer can handle the issue effectively and maintain your roof’s long-term protection.