When sliding glass doors get “sticky” they should be removed by a qualified person, and the tracks (door and threshold) need to be thoroughly cleaned and (sparingly) lubricated with a “light” oil such as 3-in-1 Household oil.
WD-40 washes off with moisture. It’s useless in wet areas. Be better off with a silicone spray in those areas, just make sure it is dry before spraying or it won’t adhere worth a damn.
And no matter which lubricant you use… make sure the area is CLEAN before applying. It is sticking because of all the crap built up, not lack of lubricants!
While I’m not a fan of applying any type of oil lubricant directly to the track, even thought at first the door will work fantastic, it also makes a get collector of dirt, as Jeff mentioned very sparingly.
“Sliding glass door was sticky and difficult to operate. Recommend adjusting/servicing roller and cleaning track for better operation.”
mmaizel
(Marvin Maizel, CMI® Fl State Lic HI 681)
14
Silicone stick. West Marine. There are also some that are sold in hardware stores but the white stick of silicone is the absolute most effective product I have used.