Uh oh! It sounds like you're experiencing dry spray with Rust-Oleum Automotive Epoxy. This is when the product dries before it hits the surface of your project. This occurs most often when users hold the can too far from the surface when spraying - our recommendation is 10-16" from the surface. Effects of dry spray can also happen when temperatures are too high or too low. You can try using a lint free rag slightly damp, and gently wipe the surface to remove the dusting. If it's still rough after doing that, you'll want to sand the surface with a 180 or 220 grit sandpaper and make sure it's clean. After sanding, you'll need to wait the recoat window before repainting. In this case, it's 7 days after you sand. If you apply it too soon, it'll wrinkle/crack.