Dear all, here are two rooftop unit filter driers that are super rusted out. We will be replacing them soon but would like to know if there is any anti-corrosion or water-proofing materials (paint, coating, etc.) that we can apply on these filter driers to prevent them from being rusted like this in the future? The building is about 2 mile from ocean so the air is salty which make these filter driers prone to rusting out quickly.

Thanks!