Using silicone to seal worktop/tile gap

10 May 2017
Reaction score
United Kingdom
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!

Last edited:
Sponsored Links
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!
Sponsored Links
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).

DIYnot Local

Staff member

If you need to find a tradesperson to get your job done, please try our local search below, or if you are doing it yourself you can find suppliers local to you.

Select the supplier or trade you require, enter your location to begin your search.

Are you a trade or supplier? You can create your listing free at DIYnot Local