Watertight structures and methods of making the same

A structure selected from the group consisting of recreational vehicle, utility vehicle, trailer, bus, walk-in van, box truck, rail car, ambulance, boat, and shed comprising:

• a. a single-sided thermoplastic film tape,
• b. a multi-sided thermoplastic tape, and
• c. a substrate-encapsulated tape comprising a substrate core encapsulated with a thermoplastic sealant, wherein a., b., and c., are disposed on the exterior of the structure and make up greater than 50% by weight of the sealant on the exterior of the structure, and
• wherein the single sided thermoplastic film tape and the multi sided thermoplastic tape comprise a thermoplastic sealant comprising:
• i. one or more thermoplastic polymers selected from the group consisting of styrenic block copolymers, styrene butadiene rubber, butyl rubber, polyisobutylene, ethylene propylene copolymers, EPDM rubber, olefin polymers, ethylene alkyl acetates, ethylene alkyl acrylates, polyester polyether copolymers and modified versions thereof, and
• ii. from 10% by weight to 70% by weight of one or more fillers.