Reinstalling undermount sink: sealing the frame properly?

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by AcidWater, Aug 14, 2015.

  1. AcidWater

    AcidWater Member

    Oct 14, 2008
    I removed the sink and the frame from the countertop. It looks like originally both were sealed with plumber's putty, back in 1966. I've cleaned the tarnish off the stainless steel frame and I can re-use it.

    Now in the 21st century, should I use putty or silicone caulk?
    1) on the top where the frame rests on the top of the Formica countertop
    2) on the "underside" where the sink is pushed up from beneath?

    Should I allow the top to set up for a day or so before installing the sink, or does it need to be able to slide around a bit when I tighten up the sink?

    I also need to figure out the size of the beads. Too much and there might be a thick visible layer of goop instead of a "tight" fit. Any tricks for getting this right? Obviously need to be careful to place same amount all around to avoid thick & thin areas, which would look bad.
  2. hj

    hj Master Plumber

    Aug 31, 2004
    Cave Creek, Arizona
    I use a"tub and tile" caulk, and use it generously, because it will wipe off with a sponge and water before it sets.
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  4. dj2

    dj2 In the Trades

    Aug 13, 2013
    You can get DAP quick seal caulk with anti mildew agent in it.
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