Zinsser Watertite Waterproofing Paint 5LWatertite waterproofing paint is guaranteed to keep water out and contains a biocide that protects the dried coating against fungal degradation for a minimum of 5 years. It can easily be applied to wet or dry surfaces creating a smooth, non gritty finish. Watertite Waterproofing Paint has a unique solvent based formula that combines a state of the art waterproofing resin with Portland cement to create a coating that stops up to 34psi of water pressure.