My company, A.V.G. Painting & Renovations, is involved in many areas of home decorating and renovating. I have been using the Trimrock product for a few years, and I must say that it is the best decorative moulding product ever used. IT'S TRUE, no nails, no glue! This product is the easiest crown to install, and one of the most forgiving in terms of uneven walls or ceilings, and irregular corners. I highly recommend the use of this product in all interior applications. If you have any questions with regards to the installation, feel free to email me.