On Wed, 13 Aug 2014 09:29:18 -0700 (PDT), email@example.com wrote:
I think you are too kind about the owner.
First, I'd try cleaning the sink to see if it is worth keeping. Plain
old Comet cleanser does a good job with one of those green scrubby
There are new products every week, but unless you find something
better, silicone would be my first choice. Getting the old stuff
cleaned up will take some time but it must be clean and dry for the
new stuff to work.
| what should normally/usually be used to seal this counter-top & sink ?
| [it appears the previous owner may have done a hasty job]
Any sealant should be underneath the counter. I've never
seen sealant put around the inside like that. On the
other hand, usually an undermount doesn't extend past
the hole perimeter, so normally there's nothing to seal.
In other words, usually the top surface of the sink is
covered by the counter.
I would try just cleaning off the mess and leave it.
If it doesn't leak around the edges under the counter
then don't do anything more. You've got granite or
composite and stainless steel. Neither is water-sensitive
and there's probably some sealant between them. So
there's no reason any more should be needed.
I don't believe that's an undermount sink. I think what's happening
here is that someone has installed a drop in sink as an undermount
Normally, undermount sinks are installed with fasteners from below.
Holes are drilled in the underside of the granite, and threaded studs
are epoxied into those holes. Then, threaded fasteners are used to
fasten the sink to the epoxied studs on the underside of the granite.
I partially agree with Mayayama. I'd cut away that caulk to make the
installation look decent and then see if it leaks. If it leaks, I'd
hire a counter top company to properly install a new undermount sink.
It looks to me that someone got a granite counter top cheap, and tried
to fit a sink to it as best they could. But, quite honestly, the
workmanship looks like it was done by a monkey. You have an attractive
and durable counter top, but it's messed up by a stupid installation of
a drop in sink. Put in a proper undermount sink and it'll increase the
value of your home.
I'd be reluctant to use a regular bathroom silicone caulk here. As was
mentioned, silicone caulks meant for bathtubs contain mildewcides.
Mildew will grow on silicone caulk nonetheless if you make a practice of
using bar soap in that kitchen sink, (so make a point of not using bar
soap in it). Use only dish washing detergents instead. And, you can
buy silicone meant for making and repairing aquariums at any pet supply
store that won't contain mildewcides. Mildew feeds on the fatty acids
of the animal fats and vegetable oils used to make bar soap. I would be
inclined to use a caulk called "Kop-R-Lastic" to seal around the sink.
Kop-R-Lastic sticks very well, but it sticks to itself even better than
it does to construction materials. So, when you want to remove the
caulk, you just get an end started and it pulls off cleanly like a
rubber rope. I would use that instead of silicone because it would
allow you to replace the caulk quicly and easily should you have mildew
problems with it.
Maybe get under the counter top and feel the perimeter of the stainless
steel sink from below. If it feels concave, so that the perimeter lip
of the sink curves downward toward you, then it's a drop in sink being
used as an undermount sink. That curvature on a drop in sink is to
prevent the plumber's putty used to seal around a drop in sink from
getting squeezed out onto the counter top. The curvature traps a bead
of plumber's putty under the perimeter of the sink to prevent water from
leaking off the counter top and into the cabinetry under the sink.
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