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Hi,
Please see pictures. The inner creast of the bathroom sink has an exposed cracked. When I take a close look, I notice it may have been an older crack that has been patched up and now it exposed again.
How can I cover/seal the crack?
Please note I have very limtied knowledge on DIY and would appreciate step by step instructions.
Thank you
Pictures attached. 
Welcome to the Bunnings Workshop community @valeriecl. It's amazing to have you join us, and many thanks for your question about repairing a sink.
It looks like it might actually be a flaking or worn spot rather than an active, leaking crack, especially if the sink isn’t dripping. If that’s the case, a simple touch-up should help restore it. To start, clean the sink thoroughly, focusing on the area around the affected spot. Use a mild cleaner to remove any soap scum, dirt, or oils that could interfere with adhesion, then rinse and allow the surface to dry completely. Next, lightly sand the area to smooth any rough edges or loose material. This will help the new paint adhere better and create a seamless finish.
Once the surface is prepared, you can use a product like Rust-Oleum Tub and Tile Touch-Up Kit, which is designed specifically for small repairs on ceramic and porcelain surfaces. Follow the instructions on the kit for best results—usually, this involves applying a small amount of the touch-up paint with a brush, letting it dry, and then applying a second coat if needed. Allow ample drying time after the final coat to ensure the repair is fully set. This touch-up should restore the appearance of your sink and protect it from further flaking.
Please let me know if you have any questions.
Mitchell
Hello @valeriecl
I suggest using a dishwashing soap so that it cuts through oil and grease.
If you need further assistance, please let us know.
Eric
