Dumapan Smp Panel Calcutta Marble 4 Lengths x 2.6mDumapan standard range of DIY watertight plastic wall and ceiling panels. SMP stands for Synchronised Multicolour Printing, a new technology allowing our high tech printing machine to print photographic true images on our products with a high resolution of 360 dpi. This ensures that your wall is given a realistic look and feel that is true to nature.