Fibro is short for fibrous cement. If you would like to paint a fibro fence, use extreme caution. Most fibro surfaces built before 1980 contain asbestos. If your fence is old or you don't know much about its history, wear appropriate safety gear while painting. Once you prime and paint the fibro fence, any underlying asbestos will be rendered harmless. Choose primer and paint that is capable of expanding and contracting as temperatures fluctuate, or you may end up with eventual paint failure.
Trim vegetation away from the fence, using an edger and hedge trimmers.
Clean the fence, using a water hose. Wait two to four hours for the fibro fence to dry.
Cover the areas beneath the fence with drop cloths.
Coat the fibro fence with acrylic latex primer, using a roller. Smooth the wet primer, using a 3- to 4-inch latex paintbrush. Wait two hours for the primed fence to dry.
Wash the brush with water.
Coat the primed fibro fence with acrylic latex paint, using a clean roller. Smooth the wet paint, using the clean 3- to 4-inch latex paintbrush. Wait two hours for the painted fence to dry. Add another coat if the primer appears to show through.
A water hose is safe to use on a fibro fence, because the moisture prevents potential asbestos from becoming airborne.
Wear a respirator throughout this process.
Do not sand a fibro fence, as this may release asbesto fibers into the air.
Never paint a bare fibro fence, or the paint will peel.
Do not use a plain latex paint on exterior fibro fence, as it will not be able to expand and contract in varying temperatures.