Well depending on dried out it is...
They do sell an Adhesive spray. Trick is not to drench the area. I've helped a buddy do his before. I suggest spraying lightly then once the area is tacky, gently lay the cloth over so it doesn't soak up the glue and that should stop it from showing threw. Any local parts store will carry adhesive spray. Just a suggestion
http://ken-co.com/permatex/99ma.htm
