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Welcome to the Bunnings Workshop community @Fitcho. It's wonderful to have you join us, and many thanks for your question about capping blocks.
Liquid Nails Landscape is a solid choice for fixing Eziwall capping blocks and it is commonly used for exactly that purpose. It is designed for exterior use and bonds well to masonry and concrete surfaces, which makes it suitable for retaining wall caps. The key thing is surface preparation, so make sure both the top of the wall and the underside of the capping blocks are clean, dry, and free from dust or loose material before applying the adhesive. Apply a generous bead, position the cap, and press it down firmly, then allow it to cure as per the instructions before putting any load or pressure on it.
Please let me know if you have any questions.
Mitchell
