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Hello @hannahbuckpitt
Welcome to the Bunnings Workshop community. It's sensational to have you join us, and thanks for sharing your questions about your basin.
I suggest brushing the damaged section with a toothbrush and try to remove all the loose particles that are sitting in the crack. Once you've cleaned it out, I recommend using PC-11 56g White Epoxy Paste. My best advice is to mix only what you need and to blend the putty very well before applying it to the crack. Push the epoxy into the crack and feather off the edges so that it does not look lumpy. Once the epoxy cures you can also sand it down if it looks like it is too high. Please note that the epoxy will dry off white and will not match your basin colour.
If you wish to touch up the damage you can use Rust-Oleum Tub And Tile Touch Up Kit.
If you have any other questions we can help with, please let us know.
Eric
