I have just built a partition wall and wish to add coving to the new wall that matches the existing coving. Existing coving appears to be 127 mm but when I purchased some it is slightly too large to match. Could the old coving be metric? The new stuff is about 1.5 cm larger.
Is there any way I can match the existing coving? I reall dont fancy removing it all and startic again: it is plaster!