I keep hearing all these stories on Bumper Letters and sill inserts. A few Years ago Evil Dan went through the process at his spring social. The adhesive as Dave stated is usually 3M adhesive high tack Ultra high bond I also have used two other brands that tend to have a higher initial tack since people usually do not clean the bumpers as well as they should ANY repeat ANY silicone residue on the bumper changes the chemical reaction of the adhesive to the bumper or sill. This was demonstrated at the Mid Atlantic spring social a few years back when one member complained that the adhesive did not stick. He put it on and it came right off along with a bunch of dirt and oil. I patiently reapplied the adhesive and this time I cleaned the sill and down it went and stayed. It does not matter whose letters you use the rule applies to all. CLEAN, Clean and CLEAN again then stick it on and be careful because now it won't come off. To clean you may use a silicone de greaser BUT after that use a mild soap and water and a scrub brush and clean it again until the black almost has a white blush to it. NOW take the alcohol pad that most suppliers include and wipe it one more time and then install the letters. Don't miss because it is not coming off. Take the same letter and put it on an unclean bumper and it will fall to the ground as soon as you let it go despite the fact that the adhesive used holds aircraft parts together at minus 60 degree temperatures. This conversation comes up about every two years so I hope that you all now are experts at installing bumper letters and sill inserts. Have fun I do think the dress up the car nicely Ken [Non-text portions of this message have been removed] To address comments privately to the moderating team, please address: moderators@xxxxxxxxxxx For more info on the list, tech articles, cars for sale see www.dmcnews.com To search the archives or view files, log in at http://groups.yahoo.com/group/dmcnews Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/dmcnews/ <*> To unsubscribe from this group, send an email to: dmcnews-unsubscribe@xxxxxxxxxxxxxxx <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/