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Two blogging friends wrote a book about Hot Glue. Angie Holden from The Country Chic Cottage and Carolina Moore from Always Expect Moore. As a craft blogger myself, I like to promote those other bloggers in my niche. I had a chance to review Hot Glue Hacks and Crafts and I am sure you will be able to find a new way to use your glue gun that you have not tried before.
You can find it on Amazon for your Kindle or as a paperback. It would make a fun Christmas gift for those crafty people in your life. Or why not consider throwing a book exchange for your group of craft friends?