On google maps search for skyline Towers Membly.on the road next to the mazeras workshop.
Fungua sasa
• Jumatatu - Jumamosi, 08:30-17:30
Two-component, high flexibility cementitious mortar, for waterproofing concrete surfaces, balconies, terraces, basins, and swimming pools. Can be applied by brush or with a roller. Available as a kit 25kg+ 10L must be used together