What is the strongest waterproofing?

What exactly do you mean by "the strongest waterproofing"? Are you referring to a specific material, a coating, or a technique used to prevent water penetration? Are you looking for a solution for a specific application, such as roofing, basement waterproofing, or outdoor gear? It's important to consider factors like durability, cost, and environmental impact when evaluating the strength of waterproofing solutions. Do you have any specific requirements or constraints that you need to keep in mind?