Caulk fills small holes and cracks in a wide variety of materials. From baths to exterior moulding, caulk is often used to make minor repairs. Silicone caulk is a durable and long-lasting variety that seals and waterproofs. Its drawback is that paint will not stick to it. However, it is possible to paint over silicone caulk.
Pour denatured alcohol onto a rag. Apply enough alcohol to moisten the rag without saturating.
Wipe the area of silicone caulk where paint will be applied. Rub the denatured alcohol back and forth to break down the caulk's slick surface.
Lightly sand the silicon caulked area with fine-grit sandpaper. Rub the sandpaper back and forth to rough up the caulked area.
Paint the caulked area with primer in preparation for painting. Evenly apply the primer with a paintbrush and allow to dry thoroughly.
Apply a coat of paint to the primed area and allow to dry. Apply a second coat of paint, if necessary, to the caulked area.