Kman's right about the blade, it will cost more than the the shop will charge to cut it.

Why don't you scribe it and take it to the shop for cutting.

You have too much material to remove and diamond pads or polishing disks are not meant to do that.

Unless you plan to do more tile work I would forget about buying more tools. Just take it to the shop for cutting.

ok. You are correct.

I deal with granite quite a bit. In my experience a cup wheel is quite effective at grinding off parts of the edge of granite slabs. The trick is to make contact with the slab so that the wheel is not tearing out crystals on the finished edge. this means that looking down on the finished surface of the slab, the front edge of the wheel should be tipped about 1/2 degree forward so that the back edge is not making contact. eye protection a must.

To scribe this seat I would simply set in in place and slide a sharp carpenter's pencil along the walls. This gives about a 1/8" scribe.

Took the stuff back to HF, scribed the seat and took it for trimming. That was good advice, thanks for steering me in that direction. Here's the fit, pretty good for walls that aren't very straight.



I thin-setted it in place yesterday, (back-buttered as advised), and this morning it's as though the portion of the slab that has the thin-set under it appears darker. Is this normal, and will it eventually change back to how it was?

The stone has absorbed moisture from the thinset. Some natural stones will do that, some don't.
You should be fine once it dries out.

Thanks, Randall.

How long should I let it dry before sealing with silicone?

Besides sealing where it meets the wall, I'll also be sealing under the front and side edges so water doesn't get to the thin-set underneath it.

You can silicone the joints 24 hours after setting the pc.
Just make sure the thinset that's exposed under the front edge is dry.

How long before the darkened slab dries up? I should wait for that to dry, yes?

As long as it takes. Can't give you any definite time frames as it depends on the climatic conditions, IE: temperature,humidity levels,etc.

The surface of the thinset where it's exposed should dry out within that 24 hour period, enough to allow you to silicone the joint.

The granite pc may take some time. Has the color changed at all?

The day after I thin-setted the slab I noticed the darker color- It's still the darker color now, I'll leave it alone this week and see what it looks like after another 5 or 6 days.