2P-10 Bonds crown molding miter joints in about 8 seconds! Pro tip: You never want to "nail" your mitered corners together. Instead, you want to glue those corners. Otherwise, expansion and contraction will cause those corners to separate over time. (Not to mention, trying to brad nail a mitered corner is no fun) This glue will set stronger than the wood itself. Simply glue... hold for 5-10 seconds and you're done! 

My crew and I have been using 2P-10 for years and would never consider installing crown without it.