Apply a suitable primer Not all primers for exterior paint for the home are created the same way. When it comes to aluminum rain gutters, it is absolutely necessary to select a clear acrylic primer. This primer will penetrate the entire surface of the gutters and ensure full coverage. When painting aluminum gutters, it is imperative to use a clear acrylic adhesive primer, which is available at any major hardware store.
On a sunny day, wait at least two hours after cleaning to begin coating the gutters with primer. It's not hard to do, but if you're wrong, the next time it rains they'll look like a blistering hot dog drowning on a grill at a 4th of July picnic. Once the surface is ready, it's time to apply a base. Ferrous metals, galvanized metals and PVC require different types of primers.
For aluminum gutters, you can use an acrylic adhesive primer or the more common oil-based metallic primer. But make sure that the primer does not contain ammonia, which can react with aluminum oxides and create ugly bubbles in the paint. While painting vinyl gutters is fairly easy and simple, painting aluminum gutters requires a little more consideration and preparation.