Scrape away the remaining paint with a wire brush or plastic scraper. Rub away the paint with either tool, paying careful to not damage the bamboo underneath.
Wipe down the bamboo rattan piece with a damp cloth to remove any remaining paint particles and dust. Allow the piece to dry completely before continuing.
Apply a thin coating of oil-based primer with a natural-bristled paintbrush. Use a larger brush to cover the bulk of the piece and a finer paintbrush to paint the nooks and crannies. Allow the primer to dry at least eight hours, or overnight before continuing.
Apply a thin layer of exterior oil-based spray paint to the bamboo rattan furniture. Shake the spray paint can for at least 30 seconds and holding it 10 to 12 inches away from the piece, apply the paint in even, back and forth motions.
Allow the first layer of spray paint to dry completely. Examine the piece and sand away any drips or uneven coverage with fine-grit sandpaper.
Apply a second and third light coating of the spray paint to the bamboo piece. Allow the final coat to cure for at least 24 hours before using.