if you're going to skimp on a coat, put two coats of primer on and one of
paint. the first primer coat is going to practically disappear into the
wood. the second will give you a surface to paint on. primer is cheaper
and it will last longer this way.
that said, i personally recommend two coats of each for longest lasting
paint job. and you've already got everything prepped..
How come there is 'bare' wood on an existing house to be repainted?
Or did you scrape all old paint off?
Cos I can understand the discussion about more than one undercoat if it was
'new' never painted before, wood!
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