Glue wont take stain. Not even black stain so you have to think of something else to deal with that. I had the same problem with my build and the only thing that helped was to cover to gluespots with 100% black stampink. Not wiped on but actually dripped on. I let that cure for some days and only then the gluespots were invisible. Not if you would, really take a closer look of course but since I'm working on coating the body wit TO I can finnaly say that the spots are gone.