I’m painting metal roll up doors. When they roll up they roll unto each other putting scratches in the new paint. How can I make the paint more durable? It is Kelly Moore’s ACRY SHILD paint. Thank you in advance for your help

I recently painted some Masonite material that had old oil based paint on it. I sanded it and applied latex enamel, with eggshell finish. I did not use a primer. After drying several days, the paint feels tacky and when objects are place on the surface they stick enough to