impermeable2

= impermeable, waterproof, water-repellent.

Ex. The sheets of paper were dipped by handfuls into hot size, a solution of animal gelatine made from vellum or leather shavings boiled in water, to make them relatively impermeable.

Ex. The next step is to minimise the effects of any possible disaster by using waterproof ownership stamps.

Ex. The 1850s also saw the appearance of photolithography, whereby a chemical film spread on the surface of a litho stone or plate was rendered insoluble and water-repellent by exposure to light.