With the pot standing right-side up (and the tarp protecting your work area), begin spraying even layers of white paint around the top half. Don't worry about completely covering the bottom portion since you're going to paint that a different color later. Pro tip: If you're painting on a high-gloss pot, you'll want to sand it down first so the paint has something to grab onto.
Once the white has dried, use the painter's tape to mark off a curved edge for the grey paint. Gently press a bone folder alone the tape's edge to ensure a clean line for the paint.
Tear off a sheet of saran wrap that's long enough to cover the pot. Cover the top portion and tape the saran wrap to the painter's tape that's already on the pot. This creates a protective "bubble" for the white paint.
Flip the pot upside down and spray thin, even layers of the grey spray paint until you've built an even color block.
When the grey has dried completely, carefully peel off the tape and saran wrap. Give the entire pot a generous coat of the glossy top coat, plant a few earthy succulents, and enjoy!