Double Sided Butyl Tape Used for Membrane Jointing, Waterproofing, Pond Liner Repair (50MM X 1.5MM X 10M)

I have been making a 5m x 4m wildlife pond and I thought I would be clever by buying patches of rubber liner on eBay and joining them together. A one-piece liner would have cost around £400 new, with the odd shape and depth of my design. After a lot of research I found this kind of butyl double-sided tape, and a few YouTube videos on how to join it.I first used Ubbink pond liner tape, which was good stuff, but I made the mistake of stretching the liner in places when rolling the tape down when it was going off to the side. I got it all down straight and put the next layer on. Then after 3 hours the stretched rubber relaxed and I end up with folds across the joint that formed a tube that water could go straight through!Ran out of that expensive tape, cut that failed joining out and tried again with this much cheaper tape.It behaves exactly the same way as the Ubbink and is just as sticky.Points to note:* Clean the rubber liner just before laying the tape.* Makes sure the rubber liner is dry all around the tape (sunny day helps!).* This stuff seems to never fully set, it moves slightly, gradually with the rubber; bit like a sticky chewing-gum.* Do NOT stretch the rubber seams as you lay this out. Roll it out in 30 - 40 cm lengths, then relaxed the tension before laying it down on the lower rubber surface. Give yourself some overlap to allow for inaccurate laying down (lay down very carefully to start with, i.e. practise on a scrap bit first!).* I decided to make sure it was firmly stuck to the rubber by using a heat gun to warm it and a solid roller to press it down. (experiment first and stop heating just before the rubber shows a colour/texture change).* Leave for 12+plus hours to fully set, more if it is cold.* Test the set by trying to pull the rubber liner layers apart. This stuff seems to never fully set, it moves slightly, gradually with the rubber; bit like a sticky chewing-gum. But a lot of force should be required when it is ready.* When done it can be folded over and crushed like the rest of the rubber it seems. I did a few tests with heavy rocks crushing a folding in the seam overnight and it was still fully sealed the next day.I did however try to avoid folds in the seams when laying out in the pond.Filled pond, no leaks. (Last photo is of the pond at a later stage with a laser level to get the rocks at the right height!)However, it was so time consuming to do the two 5 and 3metre long joins that I wish I had just spent the money on a huge liner!! If time is money for you, then I wouldn't bother joining liners to save cash. Yes, I've learnt how to do it now, but when am I ever going to do it again?!?Great tape, genuine Polyloc tape, not a cheap spin off. Works for joining EPDM rubber pond liner.

Used between battens and roofing membrane when nailing through - eliminates any chance of rain penetration through nail holes

Good quality and good value.

As described. Used it today so assume it will give me the seal. Certainly looks as if it will.

Used for joining two pieces of pond liner, it didn't stick very well

Brilliant product. I needed to repair a large tear so I planned to patch with spare liner. I searched online and everyone seemed to say you need a heat gun welder. I spent over a hundred pounds on one only to find it did nothing at all to EPDM. No melting, no bonding, just scorched. So I sent it back, thanks to the returns policy. Then I asked the professionals. They said get cold glue tape. This is amazing stuff. It's easy and it sticks like a sticky stick. Only downside is if you let it touch another part of the glue tape cause it sticks to that and there's no undoing it, but at least on a 10m roll you've got spare.

Fast delivery many thanks

Sticks ok but comes in two 5m rolls!