I need to get something better than the £ Land silicone, which is leaking
within 18 months of application.

Q1. Is there a sealant out there that the pro's use to stop leaks between
the wall and shower tray ?

AND / OR

Q2. Anyone used the soft self-adhesive tape available. Tray is 28 " / 71 cm
square, so obviously the 2.8 m length is going to come up short :-) Which is
likely to handle corners better, 22 mm versus 38 mm wide? Happy to pay extra
for a high-end brand if anyone has any recs ? The unbranded ads in the
following, may not be worth the hassle. Thanks in anticipation :-

https://www.ebay.co.uk/sch/i.html?_f... tape&_sacat=0