25062 from the original series of 20 wagons 25050-25069 (1964) definitely had BULK CEMENT stenciled accross her tank as you have probably seen in the O' DEA collection, Derry, 1967. Oddly I cannot make out the roundel due to the color and angle on a B&W photo but it must be there just below.
The O'Dea collection has a rake of 7 bubbles behind an A class passing Kildare in 1967. 2508x is from the 25 wagon series 25070-25094 (1965) but the last digit (likely 8)is obscured by the ladder. The three bubbles nearest the photographer clearly have the CIE tan/white roundel and BULK CEMENT and the remaining wagons (although illegible) all have the appropriate white color in the correct position to indicate that the visible rake of seven wagons were stenciled with BULK CEMENT. Normally 20 wagons ran in a rake behind an A class, so it indicates how common the BULK stencil was, (likely everything in the 60s)
Back to concrete, Locomotives & Rolling Stock of CIE and & NIR Doyle & Hirsch (1981) p.79 shows 25156 from the 25140-25199 series introduced c. 1972 in Drogheda (?Year 1972-1981).
Locomotives & Rolling Stock of IR & NIR (3rd Ed., 1987) p.77 shows 25152 from the same series in Limerick , year undetermined. Both clearly have CIE roundels and BULK CEMENT.
Anyone who might still have the instructions for the MIR cement bubble kits will see two liveries for the bubbles with orange, CIE roundel, BULK CEMENT from "1963-1979", and cream/ivory, Irish Cement from "1979 onwards". Clearly not everything had the cement scraped off the tanks and were reliveried immediately in 1979 (if at all)