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How to add condensation effect on a texture?

The way I add condensation effect is to add a texture image (condensation) to object material. However, I don't think we can use this method to add the effect on a texture? As it would be like adding texture on to another texture.

For example the label(coke) in picture below are a texture, how do we add condensation on it?

enter image description here

Thanks in advanced.

vuict
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    Hello and welcome :). The easiest way is to use a normal map and connect it into the normal input. That way you don't have to mix/combine anything. – jachym michal Mar 13 '20 at 06:47
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    @JachymMichal Thanks. just tried it, the condensation did appear on the label! However, it has problem on the scaling. The water droplets appeared horizontal stretched, and when I tried to correct it by scaling on the UV map, the Coke label was affected as well (became too thin or too wide). Maybe there is a way to scale individual image rather than to scale the UV unwrap area? – vuict Mar 13 '20 at 08:41
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    Hello :). Don't scale the UV map directly, but use the Mapping node for each image. This thread should help. Also, it's sometimes useful to use a second UV map for the condensation, for better control. – jachym michal Mar 13 '20 at 08:46
  • @JachymMichal hey, that actually worked :) – vuict Mar 13 '20 at 09:48
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    And now I am looking for where the Accept Answer button is..... maybe I am new that I dont' have that option? – vuict Mar 13 '20 at 09:54
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    There's no way to accept a comment :). I'll post a full answer later, so you can mark this question as solved. – jachym michal Mar 13 '20 at 10:00

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You can use a Normal map for the condensation.
That way you don't need to mix anything, just plug it into normal input.

enter image description here

Example of a normal map.
You can download this one for free from Poliigon.

enter image description here

Connect the normal map like this.
Use different Mapping nodes and perhaps UV maps for better control.

enter image description here

jachym michal
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    I am using that texture from Poliigon as well, after watching Andrew Price's tutorial :) – vuict Mar 14 '20 at 06:02