So I'm painting a garage with pre primed Hardieboard type siding. The contractor said it was fine to just hit it with finish coat. I was skeptical since I figured the primer was bottom dollar junk, plus it has been installed for at least 6 months. Now my question is, I bought SW Duration paint, which is supposedly self-priming, do you think that the combination of pre primed boards and self priming paint is enough? OR should it be primed anyway? Time IS a factor, but I don't want to be doing 3 coats of finish or have the paint sheet off in a few years.
Thanks for helping a new guy, I searched but couldn't find my specific problem.