The unit below mine spotted water mark on their bathroom ceiling when they removed the plaster ceiling during renovation. So I decided to check out applying sealer on my bathroom floors to stop the leak. Was quoted almost RM5k for two bathrooms for crystallization type sealer. This is applied on floor, 7 ft on shower walls and 4 ft on all other walls. Sounds a bit excessive to me. 2 years warranty.

What do you guys think?