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Hello @DaveP39
Welcome to the Bunnings Workshop community. It's sensational to have you join us, and thanks for sharing your question about metal shower shelves.
Would it be possible for you to post a photo of the metal shelf you are attaching to your wall? Is it going onto a tiles wall? If it is, have you considered drilling into the tile to anchor it with stainless steel screws? However, if you are only looking for an adhesive, I suggest using Sika 290ml Crystal Clear Sikaflex-112 Adhesive Sealant. It's a crystal clear is a 1-part, multipurpose transparent adhesive and sealant with good initial grab which bonds and seals most construction material substrates. It's suitable for internal and external use.
If you need further assistance, please let us know.
Eric
