"Hey Joe, or any other pros out there, exactly what instructions can I give to my fabricator other than to dig out the old epoxy, and redo with the chameleon integra glue. That alone wouldn't make the seam tighter would it? It would just change the color of the seam so it's a closer match to the marble?" The seam would not be tighter, but it would match so much better the seam would be more inconspicuous. There are tradeoffs here. If you still owe them money, you're in a much better position to make demands. How fussy are you? Are you prepared to stare at that seam every morning for the next 20 years, or are you going to put up with some short term pain for some long term gain? You are the only one who can answer these. I took another look at the picture and the only real problem is the color match on the chipped edges in the whitest section. If that is removed even clear super glue scraped to flush would be an exponential improvement. As for "instruction", let them know that you know the seam can be improved. Tell them they are getting one chance to make it right, but you'll leave the method up to them. If you aren't satisfied, you'll be hiring the repair out and back charging them. This is completely fair and if they have any brains at all, they'll jump on the chance, be grateful they've got such a reasonable customer, and will never do this again. They are welcome to contact me if they have any questions. For free.

These days, one can never assume that "professionals" know the proper way to do many things. One always needs to ask first, and yes, we all have tales due to our lack of experience. Sometimes people will ask me why I'm so cynical. I always say I was not born that way but became that way due to bitter experience!

I'm no expert, but I would think that if the cut was done correctly, the seam wouldn't be that dark. Maybe the blade was not as sharp as it should have been and tiny bits of stone flicked off, making the seam look wider. Just my musings on the subject. I zoomed in on your second photo and it does appear to vary in width, being wider at the bottom. I do think it was done with a dull blade.

.Yes, that’s what we were thinking too, if it was a better color match it would look less offensive. Not sure why they made it such a bright white, nor do I know if that’s something that can be changed? I know I can be rather particular, so I wanted to get some other opinions in case I was being unreasonable