Attach leaves: Using the artist’s brush, paint the backside of a leaf with a thin layer of Mod Podge, press the leaf flat against the house, and then coat the topside of the leaf thinly with Mod Podge. Keep attaching leaves, one at a time, back and front, until the birdhouse is covered. Mod Podge dries quickly. Apply multiple layers, allowing each coat to dry completely before applying the next one. Several thin layers are more effective and attractive than one or two thick coats.