Cohune Palm
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?
Food was the main thing, shelter and the potential for warmth.
The best waterproof glue for vinyl materials is a vinyl adhesive specifically designed for bonding vinyl surfaces.
No, they come waterproof.
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.
Caves were their shelter. they used stone as materials
A basha is a tarpaulin or a plastic waterproof sheet, or a makeshift shelter made in this style.
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.