If you end up going with a fiber version, whether made out of coconut or another source, over time you may begin to notice that a faint residue is appearing on the design. While this will not be too big of a deal for some users, it will be for those who are more anal about the quality of their belongings. A few different reasons could come into play, but the likelihood is that this will happen if you leave your mat in prolonged exposure to moisture.
Indeed, some materials are water-resistant and some are not but that still does not mean that the water-resistant materials can handle excessive water and moisture. This can begin to discolor the artwork that is present and thus, you are left with a faint residue that can look rather appalling, to be honest.