A few comments.... the lime wash used was deemed to have antiseptic properties, hence it's use. As Leslie says, it's use ceased - I'm not sure when in Ireland, but later than 1927 anyway. In latter times, wagons were hosed out. For. A modeller, a light whitish wash round the lower body sides, perhaps showing as leaking out through the doors as well, and the same whitish stuff splattered all over the chassis as well.
Regarding the wagon grey, the LNER shade is not unlike what the GNR used, but perhaps a little light for LMS or GSR, or early CIE. For those, LMS grey is better. Later, post-1960 CIE tended to use a much lighter shade on newer wagons like the then-production-lined "H" vans.
While a little off topic, recollection suggests that the cement bubbles when brand new were a shade not unlike the LNER grey above. It was certainly very slightly darker than the then current "H" vans.
Don't forget, in all cases, grey chassis, not "Hornby" black. Mainstream Irish standard wagons never had black chassis or body ironwork although certain specialised types had exceptions. Example - some bubbles had black chassis (while ammonia bogies had dark green, and acrylonitrile four wheelers had red!). Proprietary model manufacturers brought up three generations of us modellers on standard black chassis for all goods stock, just like passenger stock, and this seems to have become the single (and, I suppose, given circumstances) understandable error in model liveries.....