Thank you for sharing your experience using our Rust-Oleum Specialty Lacquer Spray. Spray painting large, flat surfaces is especially challenging, and care must be taken to ensure an even finish. Take care to apply in a steady back and forth motion, starting off the surface, and completing the pass off the other side, taking care to ensure the nozzle is fully depressed and a constant distance from the surface being coated. Shaking thoroughly prior to and periodically during the application is also good practice to prevent inconsistency. - Rust-Oleum Product Support 2