Awning Arm Bracket Cover

I have a Tiffin Allegro 36LA. It has an electric awning. The bracket/track which attaches it to the side of the motorhome has a plastic cover to protect wire and where the wire goes through the wall. That plastic cover slides into a track. We have lost the cover. It slid down and has fallen off while traveling. We have the replacement cover to slide into the track. To prevent it from vibrating and sliding out again, is there a something (like Loctite) to use that would hold the cover in the track?

p.s. The track is painted aluminum and the cover that slides in is plastic.