Hi Momo, thank you for your review. I'm sorry to hear about your experience using Premium Plus Paint. Typically, this paint will cover in two coats, while porous surfaces may require additional coats. To fix this, I recommend you remove any loose coating, sand the edges, clean any sanding dust, and touch up the area. For color uniformity, you can apply a recoat. When applying a recoat, I recommend painting in columns and overlapping on each pass. Reload your roller after each column to get the best coverage. Customer satisfaction is important to us, and we appreciate your feedback. Please reach out to us directly if you need further assistance. Our customer care team is happy to help you! - Randy