Guido, glad to hear you are back in the hobby and your sons are involved too.
As for driving the wife nuts... good for you and go for it.
They drive us nuts every chance they get. LOL
As far as your primer still being tacky after 24 hours, you might have used the impoper thinning agent and/or too much for the paint to handle properly.
What type of paint did you use?
For priming purposes I still use a spray can. I use such primers as Krylon paint (amoung others) as found in department stores.
Leaving it too dry in a warm area is about the only thing you can do now except strip it down.