Joint repair and sealants are flexible materials used to fill and seal gaps in concrete, preventing water, debris, and chemical ingress while accommodating movement from expansion or contraction. Types include silicone, polyurethane, and polysulfide sealants, applied after cleaning and priming joints for adhesion.

In Uganda, where temperature fluctuations and seismic activity stress structures, sealants from BASF and MAPEI maintain integrity in pavements, facades, and reservoirs, reducing maintenance and extending service life as of 2025.