My apartment is near the lagoon and the humidity is insane. I painted with regular acrylic paint last year and it's already peeling. I'm thinking about using acrylic paint with an anti-mold additive, but I'm not sure if it's really worth it or if I need something heavier like epoxy.
Regular acrylic paint just won't hold up in that situation - humidity will always win. What usually works better is going straight for an acrylic paint specifically made for damp environments or with fungicide already built in - no need to buy separate additives. Epoxy is overkill for interior walls, it's more for floors or very specific areas; for your situation, a good anti-mold paint will do the job and costs way less. Before painting, clean the wall thoroughly with a fungicide and let it dry completely, otherwise the new paint will peel off the same way.
Before any paint, you need to actually fix the wall's moisture problem first - for that to work, apply a coat of moisture-blocking sealer or waterproofing product like Vedacit before painting, otherwise even the most expensive paint will peel off just the same. After that, acrylic with fungicide works well, but if you want something that can really handle salt spray near a lagoon, look for textured acrylic specifically made for high-humidity areas, which has better adhesion than regular paint.
Epoxy is overkill for apartment walls, but people are right that regular acrylic won't hold up. The real problem is you probably need to improve ventilation first before anything else - if air isn't circulating, no paint is gonna fix it. After that, an acrylic with anti-mold additive + primer underneath works well, but if the humidity stays crazy even with better ventilation, then think about elastomeric, which is more flexible and handles the water movement in the wall better.
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