From the far, far reaches of the wild, wild west I am: rtpoteet
Elmer.
The above is my opinion, from an active and experienced Model Railroader in N scale and HO since 1961.
(Modeling Freelance, Eastern US, HO scale, in 1962, with NCE DCC for locomotive control and a stand alone LocoNet for block detection and signals.) http://waynes-trains.com/ at home, and N scale at the Club.
I've done similar work (bridge/trestle guardrails in Code 70) using Walthers Goo. This is a rubber-based glue that is slow to set. It allows flexibility for that adjustment. The rail should be bent to the approximate correct arc before placement. Once one is confident of location, you can heat the rail a little by putting a soldering iron atop the rail. (No solder, and not enough to burn things) This "cooks" the Goo and sets it firmly. Of course, spikes can be added as well, but this stuff holds for many years.
The caution with this method is to avoid using too much glue, as it is difficult to remove if it presses out where you do not want it to go. This glue is a brownish color, so it can be visible.
Bill
I am building a guide rail (double) on a full section of flex track, 3'. The flex, over its lenght will make a gentle S-curve, minimum radius will exceed 22".
I need a glue to attach the Code 83 gurard rail to my Atlas Flex (code 100) that will give me a little bit of working time. Mostly enough time to get glue down on 30" or so worth of plastic ties, and also enough time to reposition the metal guard rail as required. I have spacers insalled so placing won't take very long, but some positioning will be required.
Thanks for your help, and sorry if already asked and answered.
Roypea