Before painting HardiePlank siding, make sure that all surfaces are clean and dry. Use a siliconized acrylic-latex caulk to seal joints, smoothing it with your finger. Use 100 percent acrylic paint, work from top to bottom and follow the grain pattern. HardiePlank siding is easy to paint because it's pre-primed.
HardiePlank is a fiber-cement siding material that offers remarkable durability. It is also fire- and insect-resistant and environmentally friendly, as it is made from natural, non-toxic materials. As a building material for exterior siding, it is significantly more expensive than vinyl siding. However, it costs less than real wood siding, and requires less maintenance.