Losing water thru liner joint

hair dryer is a standard tool for liner welders/splicers, especially in cold weather!

By the way. Sorry about the delay in reply. An update on the server meant that a link between delivering the message and it arriving in the 'box' went missing.

There is a product called 'Wet Sticky Stuff" that although it is incredibly expensive it will seal butyl and epdm or anything even in the wet. It has to be very carefully applied because it literally sticks to anything and wont come off. And to be effective you need to use quite a bit which at over 13 quid a tube is a bit of a strain.

Having been on the Firestone liner splicing course recently I've picked up a few useful principles about making waterproof joints. In a situation like where you are joining two liners together that are not necessarily prepared/flat/ of the same age/have other joins in (any of these things and more) never rely on just one join. In other words for insurance sake, put another patch over the join. Perhaps butyl tape or silicon a patch of liner over the joint.