I just received the roof rack, unpacked it, and now I have questions. Hope you guys can help. This version of roof rack is to be installed with included Polyurethane 915 FC Sealant which uses include: permanent adhesion of glass to metal, metal to metal, construction of cars, etc. With this Roof Rack, manufacture recommends installation without drilling... just using the included adhesive. On the bottoms of the four mounts which contact the roof of the truck are metal plates which are screwed from the bottom up leaving no holes on the outside of the mounts. Its indicated I clean the surface of the truck then apply the adhesive to the metal plates and press the assembled rack onto the truck and hold in place with weight or straps for 24hrs until cured. I know the argument for bolt on Roof Racks and I agree they would be more secure, but I want to explore the situation I have with following the manufactures recommendations of no drilling. If anyone has experience, please comment. Thanks guys.