Hi there thank you for your review. I'm sorry to hear that you did not get the coverage you expected. Typically, our Premium Plus Paint will cover in two coats, while darker colors and porous surfaces may require additional coats. The minor darkening may be caused by a condition called ghosting. Which is caused by a dust build-up on the walls. To fix this issue, it's recommended to clean the walls with warm soapy water to remove the residue before painting. 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! -Ronald