tek 7
buy a tin of their own cleaner / solvent too , you will need it , and its great.
B and Q do it ,, or on line ,, just dont let the guy selling it to you away with ,,, we have tiger seal , its the same , or gorilla dung is as good , chinese chip paste works the same ,, etc etcThanks is it sold by the usual suspects or is it an order online one.
Dow corning from screwfix.
https://www.screwfix.com/p/dow-785n-sanitary-sealant-white-310ml/800fg
Ct1
Nothing comes close