If you guys are going to be doing showers and baths and tanking them properly then you are far better off buying Dura-wp membrane and combining it with sealux seals. Buying these kits for each job is expensive when you can get 25m2 of membrane for the cost of 4 kits giving you far more installs.
When you combine the propper membrane and sealux seals like below then its a sorted pro job that isnt going to leak..........
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