What is tanking? Tanking is waterproofing walls. They might be cellar walls or basement walls or even retaining walls. Tanking is applying a liquid damp proof membrane to the surface of walls or floors to stop damp penetrating through. It is more permanent than damp proof paint and considerably cheaper using SBR bonding agent and cement mixed together. You can buy ready mixed KA or cementone tanking slurry or mix your own as shown in this video. For more help with tanking, see our project here: https://www.diydoctor.org.uk/projects...