Hi LoriK, thank you for your review. I'm sorry to hear you didn't get the coverage you expected, and I can understand your disappointment. Our Granite Grip is designed to cover 40-60 square feet per gallon with two coats, while porous surfaces may require additional coats. For 600 square feet, we recommend applying about 6 and 3/4 gallons per coat, and up to four coats can be applied for better coverage. To fix this, I recommend letting the surface dry for 72 hours before applying another coat. For best coverage, I advise pouring the product directly onto the surface and using an adhesive roller by adding little to no pressure to roll it out, working in 3ftx3ft sections at a time. 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! - Randy