Need help with making a car look wet and/or applying foam shaders to it

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So recently I got the :Iray foam and bubbles" by KindredArts in order to make a car wash scene so I wanted to apply the foam shaders or decals to my car prop but when I do they just don't appear, I've been using daz 3d for a while now so I knew that it would turn out like this, so does any one knows how to use these shaders?

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I'm preety sure that there is no read me file avalible for this product.

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Also here is a link to the product: https://www.daz3d.com/iray-foam-and-bubbles

Gordig

They use Iray decal nodes, so they'll only show up in Iray preview mode or renders. Decals aren't the most intuitive thing to use, but mCasual has a script that makes them face the camera, which will make it easier to position them the way they need to be.