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.  

In india we get henna which is mixed with chemicals .this henna makes a coating on the skin .i tried removing it but it is not coming out.How to do wodhu?is wodhu valid with such henna?

Ablution (Wudhu), Beautification & Cosmetic Suregry | June 22, 2018 3:17 am
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When I’m traveling and do sexual intercourse with wife and Salat time starts I can’t do ghusl but can do wadhu What to do? Do tayammum or wadhu?
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Sheikh If Iam Doing wudhu before Sleeping…but After Half or One hour My wudhu breaks (Invalid) Did I have to do wudhu Again..