High adhesion (sticking) may delaminate resist, which then stays on stamp. Also, surface coatings such as paints and films can delaminate from the coated substrate. Break resistant laminated "security glass" was also available, which is known to delaminate. Ash can have a tendency to delaminate along the growth rings when bruised. Under these conditions "Presstoff" tends to delaminate and lose cohesion. However, composite lumber has the added benefit of being less likely to split or delaminate. Under these conditions "Presstoff" tended to delaminate and lose cohesion. Most forms of cow horn are not suitable, as they soon delaminate with use.