Patching and Plastering - Drywall, plaster, paneling in Kitchen

What is the best way to prepare my kitchen walls? Struggling with this a bit, because I am repainting the whole kitchen which is a mix of drywall (with wallpaper put directly on it), plaster, and old wood paneling (which is staying there), and old kitchen cabinets. I am looking for the most uniform (but most effective) way to prepare all surfaces for painting. I have gotten most (not all) of that paper off of all the walls, have sanded the remnants heavily, and am planning for the drywall to put a good coating of Gardz on what is left, followed by a skimcoat, then another coating of Gardz, followed by paint. Can I also use the Fardz on the plaster wall before skimcoating, to seal the few remaining wallpaper, and to provide a good skimcoat surface? After deglossing and sanding the paneling, should I also Gardz / skimcoat the paneling, or just Kilz and paint?
Thanks!

The gardz should be ok for all the drywall and plaster. The paneling will need a solvent based primer. The original oil base kilz will do, the latex kilz will not.

great - thanks very much.