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Thread: Using polyurethane caulk to seal cracks in the grout between coping and tiles

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    Using polyurethane caulk to seal cracks in the grout between coping and tiles

    Hi,

    I posted about this before I believe. My builder suggested to use Sika Limestone Polyurethane caulk to seal cracks and chipping that has developed along the horizontal grout lines at the top of the tiles. I know that polyurethane caulk was suggested to me here also. I got some, and started a portion of the way around the pool. It looks ok except that the color of the caulk is way off from that of either the coping or the tile grout. So overall I'm not thrilled with it. My options appear to be: 1) continue with it around the rest of the pool (since right now only having done a part really points out the contrast between what has been caulked and what hasn't) 2) try to scrape out what I already did and perhaps use something else to seal the joint...perhaps a clear sealant (any suggestions?) 3) continue with the caulk and then paint it a color that matches more closely to the grout (need a really good waterproof paint that also would be resistant to pool chemicals...again..any suggestions?) Problem is the weather suddenly got much cooler here in PA and so at this point I'm not inclined to get back in the water to continue the work (I find it much easier to do the caulking from inside..especially since I use painter's tape along the tile so as to get a nice clean line with the caulk).

    So...any ideas would be much appreciated. I guess that for this application polyurethane is the best choice due to the lateral movement that could continue to occur with the coping. It appears that the coping has broken away from the mortar bed (at least based on the 'run a hammer along the coping' test. This alone is disappointing since the pool was just renovated 2 years ago.

    Thanks for any thoughts...
    12,000 gallon gunite, original construction 1989, renovation 2014 using quartz plaster finish

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    Mod Squad pooldv's Avatar
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    Re: Using polyurethane caulk to seal cracks in the grout between coping and tiles

    I definitely would not paint it. I believe they make lots of colors. If not, there is probably another brand of polyurethane caulk available in other colors. Yes, the polyurethane caulk is good because it can flex and remain adhered to the surfaces.
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    2012 build and pics, 20k gal gunite, black onyx pebblesheen, OK flagstone, IntellifoVS, cart filter w/Pleatco, IC40 SWG, Solartouch, 5 12'x4' solar panels, HP50HA heat pump, 8mil solar cover, borates, TF-100 test kit, SONOS, Doheny's Discovery Robot, hot tub on bleach

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    Re: Using polyurethane caulk to seal cracks in the grout between coping and tiles

    Quote Originally Posted by pooldv View Post
    I definitely would not paint it. I believe they make lots of colors. If not, there is probably another brand of polyurethane caulk available in other colors. Yes, the polyurethane caulk is good because it can flex and remain adhered to the surfaces.

    My PB has also just suggested using a clear synthetic polymer gutter sealant...the info on it says it cures to a tough, rubbery, waterproof seal. I'm not sure that type of bead will have as nice an appearance (?) Guess I'd have to see what it looks like. He suggested this due to my saying that I don't care for the color of the limestone polyurethane caulk
    12,000 gallon gunite, original construction 1989, renovation 2014 using quartz plaster finish

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    Mod Squad pooldv's Avatar
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    Re: Using polyurethane caulk to seal cracks in the grout between coping and tiles

    That sounds pretty good if you can make it look good.
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    2012 build and pics, 20k gal gunite, black onyx pebblesheen, OK flagstone, IntellifoVS, cart filter w/Pleatco, IC40 SWG, Solartouch, 5 12'x4' solar panels, HP50HA heat pump, 8mil solar cover, borates, TF-100 test kit, SONOS, Doheny's Discovery Robot, hot tub on bleach

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