I'm making considerable progress on my prep work. I am about 60% complete prepping and priming the trim and windows. We have picked a siding color. Going with SW 6407 Ancestral Gold and the base Extra White for trim. We are using the SW Exterior Latex Primer and SW Exterior SuperPaint.
1) The SW rep recommended using Flat for the siding and Satin for the trim. I already have the trim paint in Satin. It sounds like SW Flat is still washable and will better hide imperfections on the older home.
2) I have 2125 SQFT of siding (roughly). I am priming everything before painting, not just spot priming, so I am looking for some advice on if my paint estimate is correct. Essentially, I have estimated that a 2nd coat of SuperPaint over the first coat will require approximately 50% less paint...should I consider any reduction in the paint required for the coverage of SuperPaint over the Primer? Is the estimate below correct for the siding?
Primer coverage is 350-400 SQFT per gallon: 2125 SQFT/350 = 6 gallons.
Superpaint coverage is 350-400 SQFT per gallon: 2125 SQFT/350 = 6 gallons for 1st coat, and 3 gallons for the second coat, therefore 9 gallons total
Depending on how much bare wood was exposed by the prep you may be underestimating the primer,as raw cedar can really soak it up.
Another thing to keep in mind is footage estimates given on the can are given in 'perfect condition scenarios' in other words, there is no allowance for tool/bucket waste. That can make more of a difference than you might think.
You can thin down the final coat and put it on thin if you want to squeeze extra footage out of it. Doing this though, will decrease the durability of your system. To get the most out of the system, two coats at the same specified coverage rate is the way to go. Applying the second coat very thin (twice recommended footage IS very thin), could also affect any material warranty through SW, if that is a concern.