Waterproof material is material that can withstand water. Waterproof material will not be damaged by the wetness of water being on it.
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What exactly are you planning to waterproof?
The best waterproof glue for vinyl materials is a vinyl adhesive specifically designed for bonding vinyl surfaces.
Cement itself is not waterproof, but when mixed with water and other materials to make concrete, it can be made waterproof by adding additives or sealants.
Cementuous materials are not waterproof. Hydraulic cement is the closest they come, but even it becomes saturated.
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The Velcro material itself is not waterproof, however it is available with adhesive which is waterproof, so it can be used on materials that are constantly or often wet or underwater. A velcro 'seal' or interface is also not waterproof.
Kevlar is a fiber that is knitted or woven into a material/fabric. Those materials can be laminated to be made waterproof, but Kevlar in and of itself as a finished good is not waterproof.
The best materials for constructing durable and waterproof bath tub walls are typically ceramic tile, acrylic, fiberglass, or solid surface materials like Corian. These materials are resistant to water damage and provide a long-lasting and waterproof barrier for your bath tub walls.
The best waterproof and weatherproof materials are the ones that say waterproof and weatherproof on the packaging. Then you can leave your lawn furniture out all year long.
To make a box waterproof, you can use materials like waterproof sealant, silicone caulk, or waterproof tape to seal the seams and edges of the box. Additionally, you can use waterproof paint or coatings to protect the box from moisture.
To ensure your sewing project remains waterproof, use waterproof materials like specialized fabrics and threads, and employ techniques such as seam sealing, using waterproof zippers, and applying waterproof coatings.