The best pond liner adhesives, compared.
Top pick: MyPond MS300 black, 300 ml – Highest listing score: 4.6 from 400 reviews, 300 ml at about £15.99. The order is the star line, not a laboratory test. Best value: MyPond MS300 clear – Named best value in the product file: about £16.99 with a nozzle listed. The 4.5 from 211 reviews is shared with both twin packs. Updated 22 October 2026.
Pond liner adhesive is what you buy in the UK to close a small tear, seal a pipe, or stick liner to stone. Rubber sheet, such as EPDM or butyl, is joined with a primer and double-sided seam tape. PVC sheet is usually heat-welded, and solvent cement is only for a short repair. A cartridge is for a reachable patch, not a long seam between two sheets. You recognise a usable product by whether the maker names your liner, whether a gun and a cure time are printed, and whether the job is a dry seam or a wet patch. Do not put EPDM tape onto PVC, or PVC cement onto EPDM. Liner and job size are set out in the [pond liner adhesive buying guide](/hub/fillers-adhesives-and-sprays/pond-liner-adhesive/sub/pond-liner-adhesive-buying-guide). Printed cure times are often 24 hours, or 24 to 48 hours. A fish-safe line is a listing claim, not a British Standard. Keep animals off any uncured bead, wipe grease off a wet patch, and keep a dry seam clean.
Pond liner adhesive is what you buy in the UK to close a small tear, seal a pipe, or stick liner to stone. Rubber sheet, such as EPDM or butyl, is joined with a primer and double-sided seam tape.
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Personal buying guide
Question 1 of 2
What are you repairing?
The MyPond MS300 black cartridge is a 300 ml silyl polyether tube at about £15.99 and 295 g, with 4.6 from 400 amazon.co.uk reviews. Fifty UK texts in this file belong to this ASIN only, and they are not the shared block on the clear listings. Reviewers describe leftover liner stuck without a full drain, and leaks stopped on a pipe, a split liner, a half-barrel top edge and a concrete crack below the waterline. The bullets say it cures underwater in 24 hours and name fish, plants and reptiles, though the spec table has no cure field and no certificate. EPDM and PVC are not printed; the material list says rubber and vinyl among other surfaces. It is messy: residue transfers, reviewers mention disposable gloves, and one buyer could not control the bead so the pond kept leaking. Another liner-to-concrete seam had fallen off by the next day. It is the top pick here for a small reachable patch when you already have a mastic gun, not a primed join between two sheets.
Pros
Cons
Best for: A small tear, a pipe or a reachable liner patch when you can wipe grease off and wait the stated 24 hours.
Less suitable: A long EPDM seam, or any job where the sheet name has to be printed on the tube.
Specifications
Common questions
Does the listing say this cures underwater?
The bullets say it cures underwater in 24 hours. There is no separate cure-time field.
Is a fish-safe claim printed?
The bullets call it safe for fish, plants and reptiles. No certificate is printed.
What is in the pack?
Number of items is 1. Unit count is 300 ml and weight is 295 g. A nozzle is not listed.
The clear MyPond MS300-C is 300 ml at about £16.99 and 295 g, with a sealant tube and nozzle in the pack and a 24-hour cure in the spec field. The star line is 4.5 from 211, and the same 50 UK texts sit on both twin packs, so this is not a separate test. Those texts include a liner tear of about 6 inches patched by filling the void, birdbaths held after 24 hours, and a koi-pond window described as holding about 20 kg of glass. The special-features field says fish safe, while several bullets still say black. The compatible-material field names only stone, though the bullets also list rubber. One reviewer wrote that it will not attach to EPDM, another that it would not cure under water on a pool, and one tube leaked from the bottom end. It is the best value clear cartridge here if you need a see-through bead and will check the colour on arrival, though the black single has the stronger, separate review sample for about £1 less.
Pros
Cons
Best for: A clear bead on stone, glass or a small liner patch when a black line would show, and you accept a shared review file.
Less suitable: Anyone who needs EPDM printed on the tube, or who treats the 211 reviews as unique to this ASIN.
Specifications
Common questions
What colour is printed?
The title and colour field say clear. Several bullets still say black.
Which materials are in the spec field?
The compatible-material field names only stone. The bullets also name wood, fibreglass, plastic, metal, rubber, glass and concrete.
Is the 4.5 from 211 unique to this tube?
No. The same star line and the same 50 UK texts are in the black twin and the clear twin files.
The black MyPond 2-pack is titled 300 ml, two pieces, at about £29.99. The piece count is 2, but the item weight is 295 g, the same figure as the single black cartridge, and the unit count is 1.0. The five bullets are the clear-listing copy: they say translucent and black in the same lines, and they repeat a 24-hour underwater cure. The 4.5 from 211 and the 50 texts are identical to the clear single, including a tube that leaked at the bottom and a note that it would not attach to EPDM. The spec field names only glass, while fast drying sits next to a 24-hour cure. You are not buying a stronger grade. You are buying a twin listing whose weight does not match two tubes and whose reviews are not its own.
Pros
Cons
Best for: A spare black tube only after you have checked the live photos and the parcel really contains two cartridges.
Less suitable: Checkout when you need the weight and the colour copy to agree, or a review count that belongs to this ASIN.
Specifications
Common questions
How many tubes does the spec list?
Number of pieces is 2. Item weight is 295 g, the same figure as one black cartridge, and the volume field is 300 ml.
Do the bullets match the black title?
The title and colour field say black. The bullets are the clear-listing copy and also say translucent.
Are these reviews a separate test?
No. The 50 UK texts and the 4.5 from 211 line match the clear single and the clear twin.
The clear MyPond 2-pack lists two pieces at about £29.99 and 770 g, with the container type set to cartridge and a sealant tube plus nozzle. There is no volume field; the title says 300 ml, 2 pack. Cure is 24 hours in the spec, and the compatible-material list includes rubber and vinyl, though EPDM is still not printed. Bullets also say black while the colour field says clear. The 4.5 from 211 texts match the clear single, so a 6-inch liner patch and a failed pool cure are the same anecdotes, not a second sample. At about the price of two clear singles you at least get a pack that weighs like two tubes, unlike the black twin's 295 g line. It is a spare-tube buy only if you want clear sealant and you ignore the black wording in the bullets.
Pros
Cons
Best for: A spare clear cartridge when the 770 g weight is the figure you trust and a black bead would show.
Less suitable: You need black sealant, or a star line that was written for this ASIN alone.
Specifications
Common questions
What does the pack weigh?
Item weight is 770 g and number of pieces is 2. There is no separate volume field; the title says 300 ml, 2 pack.
What container type is printed?
Cartridge. Included components are sealant tube and nozzle.
Is 4.5 from 211 a separate sample?
No. The star line and the 50 texts match the clear single and the black twin.
Oase UniFix+ 57148 is a grey 290 ml cartridge at about £27.83 and 510 g, with 4.3 from 411 reviews. The bullets name EPDM, rubber or PVC and stone, metal or plastic, and they say to process it dry and above the water for maximum force, with a stated hold under water afterwards. Coverage on the bullets is about 7 m. The spec cure is 24 hours; the bullets say 24–48 hours. The material field says PVA, which the bullets do not repeat, and there is no fish-safe line. The bullets warn that it contains dioctylbis(pentan-2,4-dionato-O,O) tin and may cause allergic reactions. Of 50 texts in the file, 19 are marked United Kingdom: a top-edge tear held after two applications, rubber stuck to rubber, and a Firestone Geosmart overflow patched, while UK buyers also report a missing nozzle and a cartridge that would not extrude until the tube was cut. It is the only row here that prints those liner names, and it is still a small-area adhesive rather than a primed seam tape.
Pros
Cons
Best for: A small dry repair or a liner-to-stone bond when the sheet is EPDM, rubber or PVC and you can keep the area above water for the stated dry time.
Less suitable: A long sheet-to-sheet seam, a wet stocked pond, or anyone who needs a printed fish-safe claim.
Specifications
Common questions
Which liners do the bullets name?
EPDM, rubber or PVC, and surfaces of stone, metal or plastic. The material field says PVA, which the bullets do not repeat.
Do the bullets say to apply it wet?
They say process it dry and above the water for maximum force, and that this is what holds under water. Drying time on the bullets is 24–48 hours. The spec fields say 24 hours.
Is there a hazard line?
Yes. The bullets name dioctylbis(pentan-2,4-dionato-O,O) tin and say it may cause allergic reactions. No fish-safe line is printed.
This double-sided butyl tape is listed at about £32.89 for EPDM, first available on 28 February 2026, with manufacturer and model both printed as amangul. The only size is the pack at 22 × 15 × 6 cm. Width, length, colour, weight, primer and cure time are all absent. The bullets say butyl rubber and that it ensures no harm to ecosystems, with no species list and no certificate. The saved listing has no star line and no review texts. A trade EPDM seam uses primer, a stated tape width and a roller over a wide overlap, and none of those are in this listing. At this price you are buying an unmeasured roll with no amazon.co.uk reviews, not a substitute for a named seam system.
Pros
Cons
Best for: Only if you can measure the roll when it arrives and you already have the primer your liner maker specifies.
Less suitable: Joining two sheets when you need a stated width, a primer in the box, or any review evidence.
Specifications
Common questions
Is the tape width or length stated?
No. The bullets say double-sided butyl rubber for EPDM. The only size is 22 × 15 × 6 cm.
Is a primer included?
Not stated. Cure time, colour and weight are also absent.
Are there amazon.co.uk reviews?
The saved listing has no star line and no review texts.
Six amazon.co.uk listings were placed in order by the star line. The score is that rating divided by 5 and shown from 0 to 100, so 4.6 is 92 and a listing with no star line is 0. Liner name, cure, underwater wording, fish line and pack were read beside that score. They were not added as extra points. The highest score is the top pick. The clear 300 ml cartridge is the best value named in the product file. Prices are the amazon.co.uk shelf prices captured for this set. This is the listing order, not a laboratory test.
Amazon star line
40%The product score is the amazon.co.uk star rating divided by 5. A file with no star line scores 0. A 4.5 from 211 that is copied across three ASINs is one sample, not three tests.
Liner named
20%Whether the listing prints the sheet you have: EPDM, PVC, rubber or vinyl, or only stone or glass. Read from the listing. Not added to the star score.
Cure and water
15%A stated 24 hours or 24–48 hours, and whether the bullets say underwater or dry and above the water. Recorded beside the star score, not added to it.
Fish and hazard line
15%A fish, plant or reptile line where it is printed, and the organotin allergen warning where the bullets state it. A listing claim, not a British Standard.
Pack and price
10%Nozzle, piece count, weight and the shelf price in GBP. The lowest price does not win when the review file is shared or missing.
Match the liner, the size of the job, and whether the surface can be dried. A cartridge is a small patch. A primed tape seam is a different purchase. A fish-safe line is a listing claim, not a certificate.
Pond liner adhesive, for a UK garden pond, is not one chemical. EPDM and butyl sheet are joined with a primer and double-sided seam tape. PVC is usually heat-welded, with solvent cement or a PVC repair kit only for a short repair. A cartridge sealant is for a small tear, a pipe, a window, or sticking liner to stone. A structural seam is a different purchase from a small cartridge. The scores on this page follow the amazon.co.uk star line. They are not a laboratory test. Start with the liner.
Do not put EPDM tape on PVC, or PVC cement on EPDM. Pond Liners Co says not to join EPDM directly to PVC without a bridging product. Bathroom silicone on EPDM is the same class of mistake.
Tape systems want a clean, dry surface, including talc off new EPDM. A cartridge sold for underwater use still needs grease and algae off. Pondkeeper prefers a dry liner if you want the repair to last. Do not press the bead flat.
A trade EPDM seam uses primer, a stated tape width and a roller, at a minimum 100 mm overlap on the Aqua Liners Direct guide. A roll with no width, length or primer, and no reviews, does not replace that system.
Black sheet can be PVC, EPDM or butyl. Do not cross the chemistries. Oase states UniFix+ for small areas, culverts, and bonding sheet to stone, metal or plastic. Joining foil sections needs that liner's adhesive or primer. Aqua Liners Direct joins Elevate or SealEco with QuickPrime Plus, QuickSeam tape and a roller, at a minimum 100 mm overlap. A twin cartridge is the same formula twice, not a stronger grade, and not a seam tape.
Tape wants a clean, dry surface. A cartridge sold for underwater use still needs grease and algae off. This set's cartridges say 24 hours or 24–48 hours. Published floors elsewhere are 5°C or 10°C, and Hutton's Gold Label sheet says do not use the sealer below 10°C or press the bead flat. Fish safe is a listing claim, present on the clear MyPond single and absent on UniFix+, which carries an organotin allergen line. These cartridges need a mastic gun.
Three typical situations, each with a recommendation from this comparison.
You have a tear, a pipe or a liner edge you can wipe, and you already own a mastic gun. MyPond MS300 black is the top pick: 300 ml at about £15.99, 4.6 from 400 reviews, with a 24-hour underwater line on the bullets. EPDM and PVC are not printed. It is not a primed seam between two sheets.
A black line would show, and you will check the colour on arrival. The clear MyPond MS300 is the best value at about £16.99, with a nozzle listed and a 24-hour cure field. The 4.5 from 211 reviews is shared with both twin packs. One shared text says it would not attach to EPDM.
The sheet is EPDM, rubber or PVC, and you can keep the repair above water. Oase UniFix+ prints those names, at about £27.83, 4.3 from 411 reviews, and says to work dry. There is no fish-safe line, and the bullets carry an organotin allergen warning. It is a small area, not a long seam.
The top pick is MyPond MS300 black, 300 ml, at about £15.99. It has the highest score in this set, 4.6 from 400 amazon.co.uk reviews, and the bullets state a 24-hour underwater cure plus a fish, plant and reptile line. EPDM and PVC are not printed. The best value is the clear MyPond MS300, 300 ml, at about £16.99, with a nozzle listed and a 24-hour cure field. Its 4.5 from 211 reviews is shared with both twin packs, so it is not a separate test. These scores are the listing order from the star line, not a laboratory test. Oase UniFix+ is the row that prints EPDM, rubber or PVC, and it says to work dry and above the water. The butyl tape has no width, length, primer or star line.
MyPond MS300 black, 300 ml
Highest listing score: 4.6 from 400 reviews, 300 ml at about £15.99. The order is the star line, not a laboratory test.
MyPond MS300 clear
Named best value in the product file: about £16.99 with a nozzle listed. The 4.5 from 211 reviews is shared with both twin packs.
Editorial
Peter F. is the editor for DIY & tools at productscompared.co.uk. Comparisons in this category are checked against amazon.co.uk listings, review evidence and public UK sources.
Guides on what to look for, how to use a product, and common mistakes.
Public UK sources used for this comparison. amazon.co.uk prices, stars and review counts were taken from the listings captured for this set on 20 October 2026.
Expert source (DIY & tools): Charlie White (Charlie DIYte) (external profile) – public expert commentary used as a research source, not as a contributor to our pages.
This page contains affiliate links to amazon.co.uk (tag pcuk26-21). If you buy through them, we may earn a commission at no extra cost to you. Prices, stars and review counts are from the listings. This is not a laboratory test.
