I have a metal chalet-style (looks like a house) bird feeder.

The "roof" of the bird feeder swivels up so i can add birdseed.

The seed falls into the "body" of the bird feeder so the birds can access the seed.

I've already primed the entire bird feeder with grey primer.

Now, I want to spray-paint the "roof" one color and spray-paint the "body" a different color.

How can I mask off the "body" so the "roof" paint doesn't spray onto the body?

How can I mask off the "roof" so the "body" paint doesn't spray onto the roof?