Ultimately every polish, whether Displex or Wenol, attacks the gold plating, which is why writing instruments should be polished as rarely as possible. Displex is well suited to precious-resin surfaces but can lead to dissolution effects on gold alloys such as fittings and pen stands. Subsequent re-gilding of fittings is mostly not possible, since these are firmly bonded to the resin. The Montblanc service offers in such cases an exchange of the affected part for a new one; a pen stand was, for example, exchanged for 49 euros. Damaged original parts are shredded or burned by Montblanc, since only flawless goods may be used.