Reply #4: I think the clue is in the "almost softening the wallboard"

[Whoa_Nelly]

Would recommend you remove as much of the primer as you can (pull/strip and/or lightly sand medium grit). Sounds like the sheetrock needs a remud before you go to next step of painting. Often stripping wallpaper pulls off the protective joint compound/mud cover that keeps sheetrock from being porous.

Below are sites that give excellent "how to" info re: applying joint compound on sheetrock

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http://www.drywallschool.com/mud.htm

http://www.mikebelldrywall.com/howtodrywall.htm

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http://www.onlinetips.org/drywall-joint-compound

http://www.onlinetips.org/apply-sheetrock-mud

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http://homepage.mac.com/mattocks/morfz/sheetrock.html