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Yes, you can paint over already painted metal, but—before painting—you’ll want to use sandpaper on the area to achieve a rough surface. This helps prevent the paint from peeling or flaking. Remove damaged paint with 120-grit sandpaper. If the paint is in good condition, use 240-grit sandpaper. Brush off any dust before applying the primer. 

Enamel paints that are oil- or lacquer-based are waterproof, making them great for outdoor surfaces. But water-based enamel paints are not waterproof, so double-check the paint can before painting your patio furniture.

When you compare limewash versus paint, the drawbacks of limewash include its relatively limited durability compared to synthetic paints, often requiring reapplication in high-traffic areas or harsh weather conditions. Moreover, applying limewash requires skill and patience to avoid issues like streaks or uneven coverage. Limewash also comes with some color variety using natural pigments, but you have fewer options than if you go with paint.

With a protective top coat, fiberglass door paint will last two or more years. Sometimes, this life span can be even shorter depending on what elements the door is exposed to. Conditions like heavy rain and snowfall don’t usually cause issues, but high temperatures and direct sunlight can quickly lead to cracking and bubbling.