Things You Will Need
You must select a durable enamel formulated to hold up under relatively harsh circumstances. Unfortunately, some enamels can melt foam and plastic. Know the right materials to use and the proper way to apply them, or you could end up causing unforeseen damage.
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Wash the foam planter with ordinary dish soap, using a sponge. Rinse the planter. Wait 1 to 3 hours for the planter to dry.
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Place the planter on a heavy-duty fabric drop cloth.
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Coat the foam planter with acrylic spray primer. Maintain a distance of eight inches between the planter and the spray nozzle as you apply. Wait 2 hours for the primed planter to dry.
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Coat the primed foam planter with acrylic spray enamel. Maintain a distance of eight inches between the planter and the spray nozzle as you apply. Wait 2 hours for the enamel to dry.
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Add a second coat of enamel to the planter if the primer shows through. Wait 6 hours before using the planter.