Repairing an undermount sink

[ironwood]

I was replacing the p-trap in my bathroom sink, the new trap required that I trim about an inch or more from the drain pipe.  I took out my handy-dandy sawz-all and was almost through the pipe when "CRASH!!" the sink came down and broke into pieces!  I had a good laugh.  Now I'm putting in the new undermount sink and the holes where the clips/clamps were from the old sink are chipped out from the sink breaking away from the counter top.  What type of epoxy should I use?  It's an old white marble counter top.  I have a Kohler sink that is heavy as hell and I want to make sure I attach it securely.  The old clips had this hard ceramic looking stuff all over them. Thanks

[Mark D.]

If you use glue use epoxy. If you use epoxy I like the instant install for this application as it is knife grade and fast setting.
I do have a concern that the breakage of the bottom of the stone may have weakened other parts of the stone. Or am I misreading what broke?

If any of the stone was broken I would expect other parts of the stone near the break to be weakened. can you use undermount supports? They are tied into the cabinet so the gravity works with them and not against them.

here is a link for the Instant Install epoxy:
http://www.defusco.com/Glues:-Epoxy,-Polyester,-etc.-Epoxy-for-Natural-Stone/c82_500/p2423/INSTANT-INSTALL-29-MINUTE-EPOXY---32oz-KNIFE-GRADE/product_info.html

Here is a link for the undermount sink brackets (2 brackets comes in the kit, one for either side of the sink):
http://www.defusco.com/Prep-Tools-Undermount-Sink-Bracket-Kit/c89_714/index.html

Glad to be of service,
Mark

[ironwood]

Thanks for the suggestions.  No you are not misreading what broke.  The holes on the underside of the counter that anchored the clips essentially popped out bringing varying amounts of broken marble with them.  None of the broken areas went as deep as the hole that was there to begin with.  Should I try to go ahead and anchor the clips in holes far enough away from the chipped surface or will the brackets work by themselves ?  How does gravit work with the brackets?  The Kohler manual says "Do not use Adhesives"  Are they including epoxies in that?  Thanks Again.

[Mark D.]

I would use the Instant Install to fill the holes where the anchors were. That will help strengthen the weakened stone. For support just use the support brackets. They will be plenty strong enough for even the heaviest sinks!

Glad to be of service,
Mark

[ironwood]

What about the seal between the sink rim and the underside of the counter?  Silicon, Instant Install, Caulk?

Thanks

Robert

[Mark D.]

Definitely use 100% Silicone caulk. If you ever want to replace the sink and you epoxy it in place you have NO shot to remove it ,

Mark

[ironwood]

Thanks