Cyra, I have never spray painted any of my large, black plastic pots, but I have painted many of my composite ones. The composite ones are more ornate though were an ugly gray color. I spray painted them off-white and have three different size ones grouped on my front walk-way. Krylon makes spray paints specifically formulated for plastic, and you can find these at any big-box store, such as Lowe's or Home Depot. The pots I have were painted three years ago and they look as good today as when they were painted. I would think this product would work equally well on those black plastic pots.
