Hi, first time at rendering with Weberpral and as easy as it seems to be to apply I am having these rings appear in my walls after applying a scrape finish on it. Can anybody advise me on how to avoid this? Is there anything I can do to get rid or will I have to redo the walls affected? With Weberpral, can I just go back over the wall after it has fully set or will I be required to remove the affected walls? Thanks for any help or advise