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Hello @Ask_Itee
I'm sorry, but I'm currently not aware of a product that will permanently cover the vanity mounting holes. I can only recommend a Kinetic Deluxe Chrome Sink Cover Plate. A lot of customers use this when they are upgrading their vanity from a hot and cold tap to a single mixer. My best advice is to check your new basin mixers size to make sure it will fit into the hole of the vanity.
If you have any other questions we can help with, please let us know.
Eric
Hi @Ask_Itee,
As @EricL has mentioned, I am also unaware of any product that would seal the holes, leaving a flush surface. Have you been provided any advice from the company completing the re-surfacing in regards to suitable options? Perhaps an epoxy filler could be used and sanded flat to the surface. You'd need to check with them to see whether their product would be compatible with an epoxy filler.
Mitchell
HI Mitchell - that seems to be the way I'd need to go, the vanity is from the mid 1980's and I'm not sure what it is made from not how to identify the material - can I ship it to you for your assessment 
"can I ship it to you for your assessment" The cost of doing so might be a bit prohibitive @Ask_Itee. 😁 You can show me some images, though!
Mitchell
Below are a few pics. Its hard to determine the material it is made from. On the top it seems synthetic (plastic coated) while the underside feels ceramic. If I can ID the material, I can make sure the plug + bonding material are compatible with the construction.material.
I think it's likely a ceramic basin with epoxy paint sprayed over it @Ask_Itee.
It would require a substantial amount of time to fill the tap holes and get it perfect. Even then, depending on the thickness of this coating, you might see your filling job through the coating. I'm unsure how much this coating will cost, but have you considered replacing the vanity? Something like the Estilo 900mm Bathroom Vanity With SMC Basin Top And 1 Tap Hole is reasonably budget-friendly. You'd need to measure the width of the space to check what would suit. That would update the entire look of the vanity instead of just refreshing the vanity top.
Mitchell
