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Unread 10-24-2021, 02:21 PM   #1
criyi
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Granite Epoxy Advice needed

I have a granite counter that has a seam just in front of the sink. I have no idea why, I bought the house when this was already installed. It has separated and epoxy would be great but the problem is I can't separate the seam to put epoxy in without fear of breaking. Any ideas how I could do this?
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Unread 10-24-2021, 05:13 PM   #2
Tool Guy - Kg
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Welcome to the forum, George!

Yeah, I don't enjoy a seam at the sink like that. What's even less enjoyable to me is that they mounted the bowl as a "drop in" versus under-mounting. It's cheaper to install it like what you have because there is no need to profile and polish the sink cut-out. And that might be the reason they did it.

I can't quite see how far apart the granite pieces are. It almost looks like they are touching and the tiniest amount of epoxy was knifed into that seam. Can you tell us how large of a gap you'd have between the two pieces if all the epoxy were to magically disappear?

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Unread 10-24-2021, 05:43 PM   #3
jadnashua
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The granite fabricator I have used (used to awhile ago anyway) gets $350 to cut and polish and provide the mounting for an undermount sink, so it's not inexpensive, but depending on the layout of the slabs, my preference wouldn't be to have a seam there, either! A hole near the edge for a sink is a potential weak point where it could crack, so it's 'safer' to seam it there. Once it's installed, though, that shouldn't be a problem.

Some epoxy is quite fluid, and might flow into that crack...some is more like honey, and probably wouldn't. There are some acrylics that might work.

You might take that picture to a granite fabricator house and ask them how they'd handle it. They will have access to more materials than you're likely to, and because they do it regularly, may give you an idea of what will work.
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Unread 10-25-2021, 08:05 AM   #4
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Seam placement depends on slab size, shape of the piece, cutout if in a full piece and material selection. Eliminating a 40" seam is preferable sometimes. Pieces like that need a biscuit but not everyone will take the time to do it. It can be repaired but not really a DIY project. Personally I wouldn't try to pull the seam, always a risk of breaking it after its cutout.

Call a fabricator and let them assess.
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Unread 10-25-2021, 12:56 PM   #5
criyi
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It is on a larger countertop so I imagine it was done to reduce the large seam. The seam looks to be touching with almost no gap. The fluid epoxy seams (pun intended ) like a good idea. I definitely didnt want to pull it apart and risk breaking. I live in a small town and the only granite guy blew me off so I'm gonna have to do this on my own.

The sink was added a few years ago, the original was not an undermount (built in 2005) and had a rougher cut
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Unread 10-26-2021, 05:19 PM   #6
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Flowing is like syrup so getting into the joint won’t go far. To make a good fix the sink would need to be removed, seam separated and re-pulled tight. Short of that it would crack again. Consider just shimming the left side rail and using clear silicon.

Keep in mind stressing the piece it is possible to crack the rail. Consider all this before you proceed. Not something I’m going to try to talk someone through not being there in person.
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Unread 10-26-2021, 09:47 PM   #7
criyi
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I ordered some 10cc syringes with blunt tips, I am going to try and inject epoxy into the crack. Wish me luck.
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Unread 10-26-2021, 09:59 PM   #8
Tool Guy - Kg
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It might be tough to get that seam to line up, if that’s your intention. You probably can’t just shim the seam into alignment. Judging by the gap in front of the sink, I think you’ll need to lower the far left end of the top or raise the far right end of the top to get the seam to line up.

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Unread 10-30-2021, 04:24 PM   #9
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My plan is to use a piece of poly and a c clamp it into place til it dries
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Unread 10-30-2021, 09:14 PM   #10
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If your intention is to only use a C-clamp to align the joint without manipulating the support on the left or right (or both) sides of the top, I’d caution you that it might over-stress and crack the granite.

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