The practical answer: pool coping and pool perimeter joints need a sealant approach that can handle Queensland sun, water, cleaning chemicals, and movement. If the old bead is loose or contaminated, it usually needs to come out first.
Why pool joints fail
Pool surrounds are harsh on sealant. The joint can be exposed to full sun, water splash, cleaning chemicals, salt systems, paving movement, and wet/dry cycles. A product that survives inside a bathroom may not be the right choice for a pool edge.
Check the edge before choosing the fix
Brandon would look at the joint width, old material, coping or paver type, access around the pool, and whether the joint can be clean and dry enough for proper bonding. He would also check whether the failure is local or runs around the whole perimeter.
Use something built for outdoor wet exposure
Pool-edge work often needs a UV-stable, flexible sealant suited to outdoor wet-area exposure and the substrate. Backing rod or primer may be needed depending on the joint and product. The right answer depends on the actual edge, not just the word pool.
Heat and exposure shorten shortcuts
In Brisbane, Moreton Bay, and coastal suburbs around Redcliffe, heat and exposure can shorten the life of poor prep. If the area is in full sun, gets heavy water splash, or is hard to dry, mention that in the quote request.
Send close photos, a wider pool-edge photo, rough metres, suburb, and timing. That gives enough information to decide whether the old material needs full strip-out before re-sealing.