The job was not easy, requiring some gravity-defying contortions to remove old paint, putty, and other debris from both the inside and the outside and then to apply sealer to 24 different sections of glass in each mullioned window. (ADD 1: That's on the outside, Kurt points out. Inside work involved cleaning 156 individual sections of glass on each window.)
The project also featured several trips down to the planta baja (ground floor), where Sr. y Sra. Recondo good naturedly retrieved for us a variety of tools and materials that landed in their patios. It's one way to get to know your neighbors.