METHODS OF FORMING COATINGS

摘要

A bitumen primer layer (5) is applied to a base sheet material (1) and while the bitumen primer layer (5) is still wet a layer of a barrier material (6) of a consistency composition and thickness is applied to the primer layer (5) such that the bitumen primer layer (5) does not bleed through the barrier layer (6) and the barrier layer (6) adheres to the bitumen primer layer (5). A coating of stone chips (8) is then applied to the barrier layer (6) in a manner such that the stone chips (8) are partially embedded at least in the barrier layer (6) so that the stone chips (8) are held in position on curing of the bitumen primer layer (5) and barrier layer (6) but the stone chips (8) are not completely covered by the barrier layer (6).