ANSWER: If you are sure there is a layer that prevents water from reaching the skin and that it is not only a color, in this case you must perform wudhu and also tayammum for the part which wudhu Water didn’t reach.  

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ANSWER: When you wipe over the head, the hair will not become wet as you’re wiping and not washing. And it’s not possible for every hair to be moist when we wipe over. 

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ANSWER: No.  You must clean the private part, change the underwear and renew your wudu.   

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