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Using silicone to seal worktop/tile gap

Discussion in 'General DIY' started by Virtus_Semper, 10 May 2017.

  1. Virtus_Semper

    Virtus_Semper

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    Morning everyone! My first ever post - apologies if it's in the wrong category.

    My question relates to sealing the gap between a laminate worktop and tiling. When tiling I left a 3mm gap above the worktop, understanding I should use silicone to seal it.

    When I did my bathroom, I got a lovely neat finish with some tape and a finishing tool, using the curved profile. However, it drives me nuts that any tiny bit of dust or fluff sticks to it - even after fully curing it still feels tacky - dusting/brushing/damp cloth doesn't work, I have to pretty much wash it off, which is OK round a bath but less than ideal in the kitchen! I used Unibond Universal sealant.

    One of the profiles on the finishing tool is a 90 degree corner, so I'm wondering if I should apply the silicone into the gap beneath the tiles and use that profile, so rather than leaving a curved finish, it's just straight/flat, so the silicone would adhere to the bottom edge of the tile and the worktop, rather than the surface of the tile and the worktop. Does that make sense?
    I figure then dust etc wouldn't collect on it as it's just a vertical surface rather than a curved one... Is there a reason people don't seem to do this and use a curved profile/wet finger other than a wet finger being faster? Is there a better silicone I should use that doesn't remain a bit tacky like the one in the bathroom has?

    I realise this might seem a small thing to worry about, but I'm really proud of the worktop and tiling and don't want to mess anything up now! :)

    Thanks very much in advance!

    Mel
     
    Last edited: 10 May 2017
  2. foxhole

    foxhole

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    You need a pure silicon sealant as the universal stuff tends to leave a less than completely smooth finish.
     
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  4. Virtus_Semper

    Virtus_Semper

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    Ah ok, thanks very much. Would a low modulus, neutral cure one be fine, or would a high modulus one be better? (Never knew there was so much to silicone!) Thanks!
     
  5. Chud

    Chud

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    Modulus shouldn't matter too much for that application - I'd say Dow Corning 785 unless it's going to come into regular contact with food etc in which case you'll want 781 (has no anti mould/bacteria component so is safe for use in contact with potable water etc).
     
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