Well, the best laid plans of mice and men, etc. I, for some reason, stopped thinking and used the wrong adhesive. That lack of thought helped me destroy the mural that took me 18 hours to paint. I am repainting the mural-unhappily. It is like going to the dentist every day. I am sure I am not the only one who has screwed up like this-my condolences. The dark area is where the adhesive seeped through. This is all I can say.