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Record Breaking Strongest Adhesive & Sealant

Adiseal adhesive & sealant destroyed the competition in an independent test. It was over 3 times stronger than the nearest competitor. Even the SCREWS STARTED RIPPING OUT in the test.

Seal Lead

(Last Updated On: 22 March 2022)

Seal Lead

To seal lead flashing, there are many different products available. Some lead sealants might do the job initially but the seal won’t last a long time. We will look at the reasons why this is case. We will also look at why Adiseal is the best lead sealer & adhesive for sealing lead as well as sticking lead & lead flashing.


Best sealant for lead flashing

The reason why Adiseal is the best lead sealer & adhesive is because Adiseal:


Best strongest adhesive sealant for sealing lead.


Strongest Adhesive

As well as Adiseal being a great sealant, it also proved to be the strongest adhesive in an independent adhesive strength test by Ultimate Handyman. In the test Adiseal was over 3 times stronger than the nearest competitor. Further details of the test are on the Adiseal page.

Independent adhesive strength test results chart where Adiseal was way ahead of all other products being tested.
Test results of strongest adhesive. Can be also used for sealing lead & stick lead flashing.



In fact Adiseal was so strong, that the screws holding the test rig down started to rip out forcing the test on Adiseal to be stopped. The test can be watched on YouTube.

Video of strongest adhesive test by Ultimate Handyman.

Adiseal will not only seal the lead flashing but it will also provide the strongest bond whether the lead flashing is being fitted to a rendered wall, a pitched roof or any other surface. Adiseal will also stick roofing felt to lead.


Seals instantly

As Adiseal seals instantly, it is possible to check whether repairing lead roof has been carried out successfully instantly. Once the repair has been carried out, pour some water on the lead sealant to find out if sealing lead has been done successfully.

Video of waterproof sealant sealing leak underwater instantly.


Provides a permanent seal

When using Adiseal to repair lead flashing, Adiseal will also provide a permanent fix as well as an emergency repair. If done correctly, the lead seal will last for years.


Permanently flexible

Adiseal stays permanently flexible meaning it will not become brittle. With temperature changes, items expand & contract. With this expansion & contraction, products that are not flexible become brittle and will crack or break causing water to leak through it. This is not a problem with Adiseal sealant & adhesive as is stays permanently flexible. Sealing lead flashing with Adiseal will last a lot longer than rival lead flashing sealants.


UV resistant

If the product is not UV resistant, there is a high chance it will fail very quickly. A roof is one of the main areas of a property where it will receive high UV radiation from the sun.


Solvent free

As Adiseal lead sealer is solvent free, it does not shrink once applied. This is a common problem with other products. For these other products to cure, the solvent have to evaporate away, causing the product to shrink and come away from the surface it has been applied to. Cheaper products tend to have more solvents leaving a weaker bond than Adiseal.

Another problem with solvent based lead adhesives & sealants is that the solvents will attack sensitive materials like polystyrene which is a common insulation material in building roofs, walls & other places.


Works in dry, wet & even underwater

As Adiseal works in dry, wet & even underwater, it’s possible to carry out an emergency repair on a leak even if it’s raining outside. It’s possible to carry our sealing lead even with rain pouring outside.


Lead sealant colours

Adiseal lead sealant & adhesive is available in a number of colours including grey to closely match the colour of the lead flashing. It is available in white, black, grey, brown & ultra clear.



How to seal lead flashing

How to seal lead flashing.

  1. Clean surface.

    When sealing lead flashing, to achieve the strongest seal & bond, making sure the lead is cleaned thoroughly first will give the best results. Adisolve solvent cleaner will help remove oil, grease, tar and other stubborn deposits. Brush away any loose debris from any brickwork, or render if the lead is being stuck to a rendered wall.

  2. Apply lead sealant.

    Adiseal lead sealant can simply be applied directly to the lead or the surface the lead is being stuck to. There is no need for a blowtorch making Adiseal much safer to use.

  3. Seals instantly.

    Although it can take 24 to 48 hours for Adiseal lead sealant & adhesive to fully cure, sealing the lead will be instant.

  4. Test if sealing the lead done correctly.

    As Adiseal seals instantly, the installer can test the seal straight way by pouring water over the lead sealant. With another product, this might have to be done on another day.

  5. Remove excess.

    To remove any excess lead sealant, use a thick cloth. Adisolve solvent cleaner can also be used to help remove any excess Adiseal.

Seal lead flashing with lead sealer.
Seal lead flashing with lead sealer.



Adiseal is a muti-purpose product & will also fix a leaking gutter & repair a felt roof.


Adhesive for lead flashing

As well as Adiseal being a great sealant for lead flashing, it is also a great adhesive to stick lead.

The advantage of Adiseal over other lead adhesives is it will also provide a strong waterproof seal as well as sticking the roofing felt.

Adiseal also proved to be the strongest adhesive by an independent test by Ultimate Handyman, as detailed above.

Whether Adiseal is being used at repairing a lead roof, fit lead flashing, installing lead flashing, sealant for lead flashing or used as a lead point sealant, Adiseal is the best product for the job.



How to stick lead flashing

To stick roof lead flashing make sure the surface where the adhesive will be applied is thoroughly cleaned. Use a brush to remove any loose debris. Adisolve solvent cleaner is the ideal product to clean & remove oil, grease, tar, bitumen & many other stubborn deposits. Using a fine brush like a painting brush can help remove fine dust.

Adiseal can be applied directly without the need for a blowtorch. Simply apply Adiseal adhesive & sealant to one surface & press down the lead flashing.

Adiseal can take 24 to 48 hours to fully cure but the sealing of the lead is done instantly. This allows the installer to test if the lead flashing has sealed instantly instead of testing it on another day. Pour some water over the seal to see if sealing of the lead has been done correctly.

As well as Adiseal being an adhesive for lead it will also bond other metals. We have a dedicated page on how to bond metal.


Where to buy

In the UK, Adiseal products can be purchased from Adiseal stockists. For other countries visit www.guglue.com

Frequently asked questions about lead seal

How quickly will Adiseal stop a leak on a roof where the lead flashing has come off?

If applied correctly, Adiseal will repair the leak instantly on a leaking roof. It can take Adiseal 24 to 48 hours to fully cure but the seal is immediate.

Can Adiseal stick a lead flashing that has peeled off from the roof?

Yes, Adiseal will stick the lead flashing that has peeled off. It will provide a very strong long lasting bond and will also seal at the same time.

Will Adiseal stick roofing felt to lead?

Yes, Adiseal will stick roofing felt to lead. Make sure the surfaces are thoroughly clean to get the best result.

Will Adisolve clean lead flashing?

Yes, Adisolve will clean lead flashing to remove oil, grease, tar and other stubborn deposits.

Can sealing lead be carried out in wet conditions?

Yes with Adiseal, sealing lead can be done in the dry or wet. This makes it ideal for carrying out a permanent fix as well as emergency repairs.

What adhesive can be used to stick lead flashing?

Adiseal can be used to stick lead flashing. It is extremely strong, flexible, waterproof and UV resistant. It has high initial grab and can work as a lead seal at the same time.

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