I have a friend, who has written a book, and he is attempting to perfect bind the book on his own. He has run into problems with the single-sheet binding, where the pages, even with hot melt adhesive are not adhering to the spine properly. The pages are easily pulled out of the spine with an even side to side pull. He's come to the point where he believes he as a single individual cannot purchase the best hot melt adhesive, and it is only sold to industry book binders. Any thoughts on this? Any help? Is there a type...