Q: If my hardboard or hardie plank comes with factory primer should I still prime it in the field.
Y: Yes- If you want the job to last a long time (perhaps 15 or 20 years) before it is ready to be re-painted then I would recommend using a top quality exterior primer followed by 2 top coats. Factory primers a thinned down, and while then tend to cover all areas, they do not have the body that a quality exterior field applied primer has. A quality field applied primer dries down to a higher millage and thus will give you better hide with the top coat, easier coverage with the top coat, better adhesion with the top coat and a more flawless finish.
One other aspect that is often overlooked is the fact that after installation of any type of siding there will be hand marks, factory oil marks, packaging marks, dust from saw blades, dust from the air and a host of other things that should be washed off. Even after washing, there will still be dust from the air and un-primed caulking lines so you are better off using a primer in those instances anyway.
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