I’m working on a customer’s lake house that was built in the 1950s. The home has a cinder block basement that seeps water when it rains. The customer was looking for a simple solution, and I suggested using hydraulic paint. Hydraulic paint needs to be mixed in small batches as it hardens very quickly. The hardening reaction is exothermic, in other words the mixture heats up as it dries, so that is interesting. It was necessary to mix the paint using a mixing attachment on a drill, and I applied it to the many wall cracks in using a putty knife. See the photos below.

Here you can see the room’s baseboard heater. It is rusted due to water seeping off the wall and onto the metal of the heater.
I scrapped the old paint and applied the hydraulic paint using a putty knife.
Project finished with a fresh coat of paint. The room looks anew!