Underside of stainless steel sink STINKS HORRIBLY!

Use a non-porous expanding foam to get into the right spots. A mfr says you can get at least partial use of a can right side up or sideways if you start it upsidedown.

I once had a can of wd40 corrode and leak several cabinets away. My sink still stinks a few years later. Some things absorb odors better. My experience only. I live with it.

Okay. Tell the kid he can go back to his TinkerToys.

Try the material that is used for "paint pads" glued to a 1/16" inch thick inch or 3 wide handle of sheet steel.

And, for multiple coats with epoxy, you can wash it after use using vinegar to get the epoxy off it.

They will likely have no luck trying to mask or cover up the odor.

Best is to get a professional to identify the odor and neutralize it chemically, if possible.

Where, in the Yellow Pages do you look for such a person ?

" Mystery Odours R-Us " ... :-)

The OP needs to find a way to remove the sink and install a new one. Period. John T.

My curiosity got the best of me, so I searched for how to install a stone counter top. They say the old horizontal plywood should have been removed before laying the stone down.

1. Cut that stinky sink out with an angle grinder.
2. Cut the plywood out with a multitool.
3. Using stout putty knives, carefully pry the remaining sink rim from the granite.
4. Install new sink using sink clips and silicone caulking sealant.

Best suggestions yet !. John T.

Any idea why plywood was used? I'm on my third house with stone slab countertops and none have used plywood as underlayment for the countertops. I can't imagine what purpose that serves or why they did it.

If you end up tearing out the countertops, plywood, and sink, be sure to skip the plywood when the countertop and sink go back in. I'm a fan of undermount sinks, but either way, the countertop goes on first, followed by the sink.

Bob F - Thanks for this idea. If I try to do more painting with the Zinsser odor blocking sealer, I'll look for "paint pads." I didn't know they made them.

I've tried this. I live in a small town, not many plumbers. I talked with the largest company's "lead plumber" who wanted to try to help. But he's never run into a problem like this before, and also thought a product like Zinsser B.I.N. would be the best choice. I then called two other plumbers, same result.

I did a lot of looking online to compare odor-blocking sealers and paints. It looked like the top-ranking odor sealer is the Zinsser B.I.N., which is not pleasant to apply. You have to wear a respirator, the fumes are terrific. But it dries very quickly, in about 45 minutes, total cure is over a few days. But it hasn't solved the problem.

Yes, this was done when before the granite top was put down. All new plywood on all the old cabinets, and then the granite placed on top (and also on top of the side extensions or flanges of the built-in type of sink).

This is probably a last resort. If I can't find any way to seal in the bad odor, I'll start contacting granite counter installers. I haven't checked to see if the company that installed the granite countertop is still in business, if so, I'll start with them to ask if they can somehow remove the stinking sink in a way like you described, or perhaps lifting up the long granite panel (without breaking it?). I'm sure this will be a very costly alternative, but if it turns out to be the only way....

Sounds dreadful, but at least you know which company doesn't know how to install a stone countertop properly. That can be useful information, assuming they're still doing it that way.

BTW, I agree with the previous poster who said to remove the sink, remove as much of the plywood as necessary, being careful not to disturb or damage the stone, then install a new sink.

Open that door and keep the others closed overnight. Check out the closed ones tomorrow for the stink. Keep in mind you can probably disconnect the plumbing, all of it, and lift off the entire countertop, sink and all. It is what was done to replace it.

ON the sides maybe you could use a router to cut away the plywood, even if you had to cut if several inches away from the sink. But that would still leave the back and front where I gather there is no room for a router or any other saw.

So forget that and how about this? IIUC, you're not going to be able to save the sink, since it's so hard to get the stinking coating off. So disconnect the drain and the water and cut away the sink from the center. You can leave the part that is trapped between the stone and the plywood, and you can probably leave** an apron of a few inches hanging straight down. Then put in a surface mount sink into the hole.

Best to shop for the new sink in advance, just in case you can't find one almost as big but not quite. But there are scores or hundreds of models of sinks for sale, you'll find one.

Agreed. That's the only way this problem is gonna be solved.