Things You'll Need
All-weather spray paint
Coir is a stiff natural fiber derived from coconut husks. Thanks to its rough, weather-resistant construction, a coir doormat excels at collecting dirt, moisture and debris from your shoes before you enter your front door. Plain coir doormats usually display a honey brown color, but you can stencil paint your own message on the mat and create a personal touch to your entryway.
Spread a drop cloth across an outdoor space.
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Attach a stencil -- such as butterflies or the word "WELCOME" -- to the center of the mat, by pressing straight pins through the stencil and into the mat. Cover the remainder of the mat with newspaper, which can also be secured to the mat with straight pins.
Shake a can of all-weather spray paint vigorously for about one minute.
Spray the stencil with the aerosol paint, moving the can in a sweeping motion about 2 inches from the mat. Wait a few minutes and spray the stencil again. Continue spraying until the fibers on the mat are sufficiently coated with paint. Allow the paint to dry.
Other types of paint may not be as effective on coir doormats. For example, acrylic craft paints can wash away over time, and may not hold up to foot traffic.