IMO using a small molding would look best - maybe door stop, it looks a little wide for quarter round. Not sure you could get a nice looking long lasting job with plaster or durabond.
Thanks for the recommendation. I did experiment with adding some molding a couple years back to one room and ran into some issues due to the two endcaps of the radiator being slightly higher, a gap below the molding as well as making it more difficult to correctly miter the corners.IMO using a small molding would look best - maybe door stop, it looks a little wide for quarter round. Not sure you could get a nice looking long lasting job with plaster or durabond.