Would love to have any advice. We purchased a white concrete table which over the past couple of years has developed some fine grey cracklines on the surface. There is no indent on the surface so really just markings. Would love to know if there is a way to treat/repair these. I assume this is from not looking after the table properly and potential shrinkage in concrete? Is this common? Is there anything which can be done to bring it back to its Day 1 position.