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Welcome to the Bunnings Workshop community @Dove. It's sensational to have you join us, and many thanks for your question about painting a vanity bowl.
You might like to post an image of the cracks so our helpful members can better understand what you're working with. Let me know if you need a hand uploading images.
If the cracks are just minor crazing in the glaze, the Rustoleum Tub and Tile Refinishing Kit should cover them without any issues. However, if the cracks are large enough for water to seep through, the product might initially seep through as well until it fills the cracks. In that case, you may need to apply a couple of additional coats before the cracks are fully covered and no longer noticeable.
Please let me know if you have any questions.
Mitchell
Thank you for your advice. Here ius a picture of the cracks in the vanity.
Hello @Dove
Thanks for posting that photo of your vanity basin. If you run your finger over the crack and you can't feel the crack and it seems like it has formed under the ceramic glazing, then there is no need to use any form of filler. But if the cracks have affected the surface of the basin, then you'll need to apply several more coats to the affected area as Mitchell has mentioned. The crazing is still very fine and has not completely deteriorated the basin.
If you need further assistance, please let us know.
Eric
Hi @Dove
I suggest using Selleys 50g Knead It Aqua Epoxy Putty. Mix it very well in your hand and push it into the crack as far as possible and then feather the surface so that it is at the same level as the bowl. Make sure to give it enough time to cure before painting over the surface. It can be sanded down if you wish, but it's better to level it as flat as possible.
However, if the crack is too shallow, I suggest using Gorilla 59ml Glue Bottle - 59ml. It's temperature tolerant and is waterproof.
If you need further assistance, please let us know.
Eric
