Rustic resin is slightly more porous than our other resin finishes (i.e. - gloss black or gloss white) and as such should be treated the same way you would treat a non-sealed stone surface as these finishes are unsealed and untreated.
While the surface does not stain particularly easily, we would always recommend the use of placemats/coasters and all spills should be cleaned immediately. The rustic resins are designed to patina and mature with use and that should add to the beauty of the piece. Clients should be aware that the darker finishes (cocoa and coal) are generally more resistant to visually evolving with time.
Cleaning is easily done with a clean damp cloth and dried afterwards with a clean cloth.