Thank you for reaching out and sharing your experience, Mike. Certainly, it is important to thoroughly shake the can prior to use, and occasionally during use as well. The can should be shaken for no less than one minute after the mixing ball in the can begins to rattle. Shaking often during application also ensures there is not settled pigment in the can.
You also want to make sure the finger that presses down on the nozzle stays clean and free of any paint. It is important to have your index finger centered on the nozzle itself. If your finger is too forward, it can cause some blocking of the spray mist as it comes out of the can, which can cause sputtering or larger drops to be sprayed on the surface.
For the best coverage and appearance with Rust-Oleum Specialty Fluorescent Spray Paint, we do recommend applying over a white base coat or surface.
- Rust-Oleum Product Support 3