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Mike in Arkansas 02-12-2010 10:18 PM

Replacement sink with cast iron model
Purchased a cast iron kitchen sink today to replace an old acrylic one. The acrylic was installed in a bed of some kind of flexible caulk. I was lucky to have a multi-master to be able to get under the lip and break the bond using a scraper attachment. Love my multi-master. But I digress. Instructions for the new cast iron replacement just say to put the sink in the hole and put a bead of caulk around the edge. Would it be better or not to put a bead around the hole edge before putting the sink in? The counter top is tile and the existing hole is going to be oversize a little so that I will only have about half the overhang had the hole been the size of the template that came with the sink. Will that matter at all? Should I build up the edges of the hole with strips of wood? I was very surprised by how heavy the cast iron sink is.:eek: Oh yeah, getting a bead of caulk on the back side is going to be tough. Any recommendations for that problem? Thanks.

RegeSullivan 02-13-2010 12:22 PM

I don't think the ovesized hole with be a problem. If it is, the wood will not help anyway. The way I do a cast iron sink, set the sink in place, center it, use painters tape to tape off the counter top around the sink leaving 1/32 to 1/16 gap. Remove the sink, clean the counter top and sink with alcohol. If it is a used sink sand down the part of the sink that will contact the counter and paint it with a metal primer. Put a good bead of silicone caulk on the counter. With a strong helper lower the sink in place and get it lined up as quickly as possible. Scrape and wipe up the excess caulk. Quickly remove the tape and finish off the caulk immediately. Be sure you are well prepared with what ever you will use to trim/clean the caulk before you apply it.

If you try to get away with caulking after you set the sink in the hole you will get rust bleeding onto the counter in the near future.


Mike in Arkansas 02-13-2010 05:59 PM

Thanks so much Rege. Would it be okay to use Dap bath caulk instead of silicon under the sink. And, if I apply caulk under the sink I guess I still need to apply a bead around the parameter. Correct? Thanks again.

RegeSullivan 02-13-2010 06:14 PM

Do not apply more caulk. That will cause more problems than it will solve and it will not adhere properly to the partially cured caulk. Make sure you put a bead large enough on the counter so it squeezes out from under the sink a little. You should have a nice neat very, very small line of caulking showing around the sink after you smooth out the bead. The tape helps keep this neat and clean.

Yes - use DAP Premium Kitchen & Bath Adhesive Caulk w/Microban.

Good luck with your project.


Mike in Arkansas 02-13-2010 07:11 PM

Again, thanks Rege.

RegeSullivan 02-14-2010 08:12 AM

Glad to help... Let us know how it works out.

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