After your power washing & wire brushing & scraping & sanding. If the paint & primer on you house is oil based you can brush on a coat of linseed oil to help re-stick any loose primer/paint that you didn't get rid of. We did this on my cousins old farm house on the advise of his father in law who was a painter all his work life before he retired. It works. We didn't have any problem with flaking or any loose paint. About 7 or 8 years later they decided to remodel & there was still no sign of loose or peeling paint. This was the old smooth siding where 1 strip of siding was a 3 lap piece. House was built sometime in the 30's I was told.
"Forget the flat stuff slap something on the spinny thing and lets go, we're burning daylight" Bart Leetch
"If it ain't round you may be a knuckle dragger""Turners drag their nuckles too, they just do it at a higher RPM"Bart