Dear Robin:
A good repair can only be performed by a professional stone restoration contractor. Maybe the chip is not deep enough and must be made deeper for proper bonding of the filler. Once the filler is cured it will need to be ground down to the level of the surface of the stone and polished to blend in. Not an easy job, as I am sure you can understand.
As for your second question, Ubatuba is not true geological granite. It is charnockite, a stone that for the intents and purposes of a kitchen countertop can be considered even “better” then true geological granite. In fact, being as dense as it is, it does not require any sealing, for it is naturally stain-resistant. The only possible drawback is that certain batches of Ubatuba are sensitive of UV exposure and can change hue over time. Other than that (which if it happens can't be helped – but I don't consider it a big deal), all you need to do is learn the basics for good stone routine up-keeping. In fact,
The issue of what you'll be doing day in and day out to your stone is – as it should be intuitive – vastly more important than its sealing
(if and when possible and/or advisable – which in the
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Ciao and good luck,
Mauri
Article ID: 1002
Created On: Sun, Jan 6, 2008 at 10:15 AM
Last Updated On: Sun, Jan 6, 2008 at 12:00 AM
Authored by: Maurizio Bertoli [mail@mbstone.com]
Online URL: https://marblecleaning.org/knowledgebase/article.php?id=1002