Which sealant to use?

Emmia Posts: 2,953
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The sealant in this joint on our quartz worktop appears to have failed, due to too much flex in the area which I've now fixed.

I'd like to seal the joint back up, and around the sink as on close inspection, it's also looking a bit dodgy.

What would be the best product(s) for this, ideally fairly foolproof as I'm a novice at this (but I do own a sealant gun thing)

Thanks for any advice 


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