This question has been debated in Islamic jurisprudence for centuries. A source-based, practical answer:

What the Qur'an Says

The command to wash in the Qur'an focuses on cleanliness and intention. No verse states "water must reach the skin".

Hadith: Sahih Muslim 243

Emphasis is on thorough washing — "do not leave a dry spot". Henna, oil and beeswax were used in that era; they too form a layer but were never declared haram.

Modern Science + Spectrum

Permeability isn't yes/no — it's a spectrum. Modern microporous films let water molecules through. The classical fiqh assumption ("if it covers, water can't pass") can be revisited with modern technology.

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