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Welcome to the Bunnings Workshop community @Celia1. It's brilliant to have you join us, and many thanks for your question about fixing a handrail.
It would really help to see a couple of photos of the handrail and how it connects to the posts and balusters, as that will make it much easier to give you specific advice. If you need a hand uploading images, just let me know.
That said, glue alone is very rarely enough for a handrail, especially outdoors. Traditionally, handrails are not glued at all, they’re held in place purely with mechanical fixings. Even if it looks like there’s nowhere to nail or screw, there usually is.
In most cases, the handrail is fixed diagonally rather than straight through. For example, you can fix through the top of the balusters up into the underside of the handrail on an angle, or nail or screw diagonally through the handrail into the posts at each end. Often there will be fixings driven from the top of the handrail down into the post, and also from underneath the handrail up into the post, both on an angle. These angled fixings are what give the handrail its strength.
Depending on the spacing, it can be a bit fiddly to get a drill in between the balusters, but that’s usually how these are secured. Once mechanically fixed, you can add a small amount of exterior-grade adhesive as a supplement, but it shouldn’t be relied on to hold the rail.
If you can share a few photos, I’m confident we can point out exactly where and how to fix it properly so it stays put long-term.
Please let me know if you have any questions.
Mitchell
