Because the rubber band leather products to adhere to the lack of infrastructure is the result, with products ranging from infrastructure to make sets and not according to the spec 9 um.
Due to the use of a rubber band attached to the frame of the product to the result to hit the frame until the coating products can not reach, and not according to spec 9 um.
Because the rubber band using the strap products to adhere to the project, thus resulting in lack of product structure and impact the coating solution in less than and not by spec 9 um.