I am removing the undercoating on my car to redo it because there are some cracks in it. This is the original undercoating, and it is very thick. Where can I get this type of undercoating? Pictures of a piece of the removed undercoating are attached below.

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Original was Wurth Schutz (rubberized undercoating that’s paintable). It was beige in color. Still available from Wurth but only in black (and maybe grey in some markets) so, especially if a light color, if your only option is black it will need to be primed before paint. Alternatively, some use a bedliner that’s tinted beige. Here’s a short video showing how the Wurth Schutz is applied with different textures: https://youtu.be/PvupSOhvUR8?si=acqnpgvbj9TmWGLF