I have read the sticky re priming walls for paint but it didn't fit my question so here we are

I've got three walls to paint, they were woodchipped before

I'm going to sand them a bit then coat them with Zinsser Gardz to seal the paste remnants etc then repair two walls and attempt a light skim coat on the one really bad wall followed by a sanding to remove any snots etc.
I'm not sure what to do after the repairs & skim - do I seal again with the Gardz or go straight in with diluted non-vinyl emulsion or something else?
No PVA will be used here
