What are the best techniques for painting cement board to ensure a durable and long-lasting finish?

The best techniques for painting cement board to ensure a durable and long-lasting finish include:

1. Clean the surface thoroughly to remove any dirt, dust, or debris.
2. Apply a high-quality primer specifically designed for cement board.
3. Use acrylic latex paint or epoxy paint for the topcoat, as they adhere well to cement board and provide a durable finish.
4. Apply multiple thin coats of paint, allowing each coat to dry completely before applying the next.
5. Consider adding a sealant or topcoat for extra protection against moisture and wear.