Silicon (or ms polymer,) mastic over Bangor slates

Joined
5 Dec 2010
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United Kingdom
I use mastic along the vertical spaces between the slates as a quick repair job if there is water getting in under the slates.

However I find it very hard to get the right colour to match the slates.

Is there any way to match the mastic colour to the slates? (transparent doesn't work either as it turns opaque quite soon)
 
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