theyomper

Depends on the coving. If it's plaster coving then it would need to be supported, if it's paper faced coving, which is lighter and easier to work with, it wouldn't need as much support. When I fix coving I use a panel pin against the edge rather than through face. Pins could be placed in the grout line. When you are happy that the addy has set then take out the pins and run a bead of decorators caulk around the edge. That will close any pin holes and give a surface to paint on. Better than screwing throught the face and no need to fill the holes.Silicone will not take paint.