You can get it in as large sheets you need from car glas companies.
If you want to waterproof it, however - get the Tamiya 54133 TRF511 body and fairing ver 1. it includes a lexan undertray that seals better than tape does.
Or are you looking for tape to seal the stock body and undertray better?
Keep in mind that very few ESCs are water protected, let alone water proof. Novak GTB is one of the few. Receiver and servo are easier to protect from the elements.
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The Tamiya Sheep
Various Tamiyas including TRF201 and TRF511
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