Air carrier Captain reported a lack of airport signage and runway identification markings at EIDW/DUB as the taxiway was undergoing re-painting.

Narrative

Taxiing out for departure in DUB to runway 28R we were told from taxiway holding point Neptune to proceed to runway 28R via N1 and line up and wait. We proceeded after the runway stop bars located immediately after N2 intersection were turned off. We continued via N and made the turn towards the runway end. I was surprised to find that other than a taxiway centerline there are no markings; no hold short markings; or runways identification as all have been covered up. Paint on the taxiway surface looks like it is being repainted. Other than our Nav Display there is no way to reference runway 28R (other than experience.) I double checked NOTAMs after takeoff and confirmed that there is no mention of this work in progress. Visibility was good but this could become problematic in reduced visibility. The only thing that I can come up with is the technical hold short point / markings are the red lights right after Neptune/ N2 intersection and that is considered the entry point to the runway for full length. Just an observation that caught us off guard since that is not what we are expecting to see. There was no painted taxiway painting alerting us to the fact that we were approaching the runway either right after N2 or closer to the runway.