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Hey guys, quite the quandary. I made some R/QS white oak counters. Finished with 3 coats of general finish high performance poly. The Inside edge (can’t see it now since the sink is installed) where the cutout is for the sink is finished with 6 coats. I used GE silicone 2 kitchen and bath for mounting the grade 304 stainless sink to the countertop. Before I even turned the water on, the countertop began to exhibit this black staining. Within about 12-24 hours it started to appear from the time I caulked the sink in. The staining is only seen on the sides of the sink, not the front or back, so it makes me think it has something to do with the end grain soaking up the caulk and having a chemical reaction with the tannins in the oak. I’m real bummed as I used a lot of good material and the rest of the tops all look great. My only thought was to take the sink out, sand the counter back down, use some oxalic acid to try and remove the staining, refinish and next time mount the sink with a less volatile compound like latex based caulk? Has anyone ever seen this before? Any experience here is appreciated! I don’t mind trying again, but not sure if it’s in vain. Thanks, photo should be attached
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