I want to start priming the house today, its T1-11, with a dark brown stain, so I'm priming with Kinzers stainblocker primer before applying the latex paint. Do I have to sand the rusty nail heads? I've been researching this project for some time, and have found mixed opinions on the nail heads, would add a lot of extra time to the job. Did get a really good primer, don't think the can says anything about rusty nail head sanding. Want to do the best job possible, don't want rust to bleed thru my green paint, what would you do/have done?