I'm going crazy. We bought this house built in 1950 in 2003. Paint was coming off of the cedar clapboards in broad sheets at that time. We scraped off all of the loose paint, sanded the edges smooth and used an oil primer over everything, bare wood as well as the paint that seemed to be in ok shape.
We then painted with a latex exterior paint, (brush and roller). Deal is, each year we get a fair amount of bubbling and peeling on the south, west and east exposures.

The north never seems to be problematic.
So we scrape the loose stuff year after year and repeat the process. Something's not right. Someone told my wife that if the cedar was not treated correctly from the start that it will never have paint stick well. I hope that's not true. Anyone ever heard or a primer called peel check? If so, is it any good?
Thank you for any input