Hello all, I'm in desperate need of good advice here and I'm hopin' that one or more of you can help me out. I'm making a display for use on a motorcycle that involves some LEDs. The build info on this project bike is here. You need to register to get into this site, but no worries, Glenn (the Admin) will not spam you..... The LEDs in question are mounted on a section of PVC pipe that has been filed flat so that the LED mounting collars will sit flush with the exterior surface of said pipe. Here is a closeup of one: I need ideas on how to make this LED mount waterproof. My original idea was to smear some RTV inside the section of pipe, over the bottom part of the LED, but that will not work because there is not enough room for me to get inside the pipe and smear said RTV around. I tried smearing some of the same RTV around the outside of the mount, hoping to waterproof it in this way, but the RTV did not adhere well to the subject surfaces. Please keep in mind that the mounting collar must be sealed to the PVC pipe and that the LED lens needs to be sealed to the inside diameter of the mounting collar. These are my requirements: 1. The sealing method must be waterproof, weatherproof, UV resistant, and very durable (lasting 10 years or more under savage conditions). 2. The sealing method must not damage the LED lens in any way. 3. The sealing method must be strong enough to keep the LED and its mount from moving around (note that the hole I drilled in the pipe was the smallest I could get away with - the fit is fairly snug already). 4. The sealing method must not obscure the LED from being viewed. I'm thinkin' that some type of glue will work, but which one? I had a notion to try super glue, but I don't think that that stuff holds up well to moisture over the long term - I could be wrong, though. FWIW, I found these: http://www.digikey.com/product-detail/en/A-LED8-1RBAS-MR7-1-R/AE10577-ND/2295434?cur=USD However, they are much too spendy for me! FYI, here is the package that the LED and its mounting collar came in: I'm lookin' forward to your expertise, wisdom, and experiences! TIA!