Hi Homemaker, thank you for your review. I'm sorry to hear about the odor, clumps, and poor coverage you experienced when using our Interior Marquee Ceiling Flat Paint. Our Marquee paint is a water-based coating, so any residual odor should subside once the coating dries. To help air out any lingering smell, we recommend increasing the ventilation in this room. Fans can also be used in the doorways and windows facing outward. This paint should have a smooth, creamy consistency after stirring for 3-5 minutes, and when tinted to a one-coat color and applied over a previously painted surface, it is designed to cover in one coat. Your 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