I did a wetmap cache on geo but when I try to render it on a lopnet with karma the material library overwrites the wetmap and the wetting effect is lost on the render, every time, no matter where I search there isn't any guide or tutorial or a guide that could tell me whats wrong or how to do it.

I did the wetmap based on a tutorial, but it only goes on to teaching how to do the nodes on the geometry:

<iframe width="560" height="315" src="https://www.youtube.com/embed/zHERTeOmm7w [www.youtube.com]" title="YouTube video player" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share" allowfullscreen></iframe>

If it can help to understand my problem Here I will attach a picture of my lopnet nodes.

the wetmap comes from the attributes you created. what he did was just viewport visualization. the data is still there, you have to use it in the material. the viewport visualization won't affect the render.

in karma you can get custom geometry attributes using the geometry property value node. In the photo I attached, I am using the wet attribute to affect the color. You have to use that the geometry property value node to get the attribute, then use the data in the material in some way. If you need, I can put an example together.