1.there is a large amount of white stains on the backboard produced by our company
after confirmation,the backboards are usable.are there any further problems concerning backboards after that?should we start applying the backboards after your reconfirmation?
2.the white stains should not be appearing on the backboards as required.what is the cause of the problem?
3.the requirements of appearance of the backboard of our company are:clean,stainless,no folding,and uniform color.