Native speaker
In Emirati Arabic, “Do not get the cast wet” is لا تخلي الچپس يتنگع (laa itkhalee il-chibs yitnaga').
لا تخلي الچپس يتنگع
Do not get the cast wet.
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It's in the phrasebook under At the doctor, with 251 more like it.
Source: DLIFLC Emirati Medical Language Survival Kit (2007). Credits and licences