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

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.

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.

Sticks ok but comes in two 5m rolls!

Having had problems with my pond liner for some time now, I’ve tried different repair products which have not worked. I can honestly say that this product is, so far, perfect for sealing some very large cracks that required major repairs. I did overlay the butyl tape to improve the sealing quality and with some of the very large cracks apply a waterproof silicone sealant inside before applying the butyl tape. I did have problems trying to get a clean surface as I didn’t want to damage the pond liner further, but with careful application the tape did seal sufficiently to prevent leakage. The only problem I had with the product was making sure the backing tape came away without removing the butyl tape itself, allowing me to properly overlay and seal the butyl to the liner. Although my pond still has a slight leak somewhere that’s because I haven’t been able to locate all of the tears in the liner yet……still under investigation!! Great product so far!!! Highly recommend this product for pond liner repairs.

Did the job of holding roof felt down, easy to seperate from backing as it not right up to the edge.

Georgie needed to add 1.4m in length to her existing pond liner. Georgie decided she could use spare liner from storage in the shed, so Georgie researched thoroughly into how to join the pieces. Georgie patted herself on the back a bit for finder a cheaper option than the £160 for new liner. Georgie ended up paying out just shy of £86 for 3 seperate solutions including this butyl tape one, a waterproof paint with furry bits in it which was very sticky& stinky and also a tube of waterproof seal/glue which promised to bond even under water. Georgie tried emptying & refilling said pond three separate times now, with discard of first join and attempt at second join which also went belly up. And 3 times woke up to 1/4 water loss from pond. Georgie lost 3 koi to a heron whilst they were temporarily housed. Georgie then conceded that she should just buy a new, (much bigger liner which cost way more because that's the only thing in stock and she's desperate not to lose any more fish), and just be done with it. Moral of the story. Don't be like Georgie! Who ended up paying out way more than if she'd just accepted that sometimes it's just not worth trying to save a bit of money. Seriously. I have a HDPE liner so perhaps it's just not compatible, however even with all three items used together, we could not get a watertight seal. Maybe I was asking too much of it. However it did stick it just wasn't watertight hence 3*

I needed to add another strip of butyl rubber all round the top of an existing pond liner. It was tricky to do, but this tape really sticks and did the job. Very pleased. However, you have to be extremely careful not to stretch either the tape or the butyl liner as you put them together, as that causes wrinkles that water can get through, and you cannot peel off the tape - it sticks permanently as soon as you put it down, so you need to get it right first time.

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