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.

Waterproof Sealant

(Last Updated On: 13 March 2022)

Waterproof Sealant

Adiseal is a great waterproof sealant & adhesive. It works in the dry, damp, wet & even underwater. Adiseal can seal leaks instantly even with water pouring out. It is available as a clear waterproof sealant as well as other colours. It can be used internally as well as an external waterproof sealant on wood and many other materials.

To show how good Adiseal is, we carried out a demonstration. For the demonstration we first cut a 10mm by 250mm hole into a large plastic tub. It was then filled with water. With the water pouring out through the hole, Adiseal was applied underwater, sealing the leak instantly.

Waterproof sealant underwater sealing leak demonstration.
Waterproof sealant demonstration., sealing leak underwater.

Internal & external waterproof sealant

Adiseal can be used indoors as well as an external waterproof sealant. It is UV resistant, stays flexible & has a wide temperature resistance.

Video of sealant sealing underwater.

A good waterproof sealant needs to be able to cure even underwater, resist mould growth as well as stay stuck to the material surface when in contact with water.

Best mould resistant sealant test

To find out what is the best waterproof sealant, we carried out several tests including a mould resistance test. The test was carried out by applying different products inside new plastic cups. The cups were then filled half way with tap water. Each cup was then covered and kept in the same conditions, to be fair to all the products being tested. The best product was Adiseal. It had the strongest mould resistance from the products tested. The image below shows the test results between Adiseal and a competitor product claiming to be number 1.

Mould resistant waterproof sealant test vs popular competitor. Adiseal has stayed mould free longest whereas *** sealant and adhesive has become mouldy.
Strongest mould resistance test results.


Mould resistance test result

As can be seen in the image above, Adiseal has stayed mould free even after 90 days of being submerged in the same water. Both the water and sealant have remained mould free whereas the competitor product has not.


Clear waterproof sealant

Adiseal Ultra Clear sealant & adhesive is also a very clear waterproof sealant. Other sealants might say clear on the tube but when applied, they are instead cloudy or have a coloured tint. Cheaper silicone sealants tend to be very cloudy, almost white in colour when you apply.


Adiseal Ultra Clear has strongest colour retention in water

Clear waterproof sealant in water comparison. Adiseal Ultra Clear waterproof sealant has stayed clear whereas *** clear sealant and adhesive has turned white.
Colour retention of sealant. Test in water.

Adiseal also has the strongest colour retention when underwater. As the image shows, the competitors clear product has turned white whereas Adiseal has stayed clear.


Colour test of clear waterproof sealant

To carry our the colour test of clear waterproof sealants in water, the products from different manufacturers were first applied inside new clean plastic cups. They were then filled half way with tap water & covered.

Clear waterproof sealant test in water. Adiseal Ultra Clear waterproof sealant has stayed clearest.
Waterproof sealant clear test results in water.


Adiseal top in colour retention test

From the test, Adiseal was the only product to stay clear above & underwater. Competitor products turned white below the water line. A competitor product claiming to be No.1 product was the worst performer. It turned white both above & below the water line. The competitors old formula clear product actually performed better than their new version.

Other Benefits of Adiseal Waterproof Adhesive & Sealant

  • Works in dry, wet, even underwater
  • Good initial grab (for even more grab, use the other Adiseal colours or Adiseal Hi-Grab)
  • Gap filler adhesive
  • Resists mould
  • Over paintable (paint can be mixed into Adiseal Ultra Clear to make custom coloured sealant)
  • Non brittle
  • UV resistant
  • Virtually odourless
  • Isocyanate free
  • Solvent free
  • No shrinkage or cracking
  • Flexible adhesive
  • Prevent fungal growth
  • Prevent bacteria growth
  • Good resistance to chemicals
  • EC1 Plus certified
  • ISEGA certified – safe for use in food preparation areas
  • Suitable for internal & external use

The standard adhesive drying time for Adiseal is 24 – 48 hours to fully cure. Curing times can increase in colder temperatures.

How to use waterproof sealant

Details of how to use a waterproof sealant.

  1. Pick suitable sealant

    Adiseal will be able to seal in the dry, wet and even underwater.

  2. Clean surface

    To get a good long lasting seal, making sure the surface is clean is vital before applying the sealant. If there is any grease, dirt or mould, clean that first before applying the product. Adisolve is ideal at removing dirt, grease, old sealant and other stubborn deposits.

  3. Apply sealant

    With Adiseal, simply apply it to the area that requires sealing. Make sure any gaps a filled and covered.

  4. Seals instantly

    Although Adiseal can take 24 to 48 hours to fully cure, it should be able to seal straight away.

  5. Remove excess

    Remove any excess sealant to get a good clean finish. This can be done whilst the sealant has not cured yet. If the sealant has already cured then cut the excess off with a sharp knife.

Waterproof sealant for wood

To show Adiseal’s performance as a waterproof sealant on wood, we carried out a demonstration. In the demonstration we applied the waterproof sealant on wood and brick. It was done in both dry and wet conditions. As can be seen in the images below, the product sticks to dry and wet surfaces.

Applying waterproof sealant on wood & wet brick.
Applying waterproof sealant on wood and wet brick.
Grab demonstration of waterproof sealant on wood & brick.
Instant grab demonstration of sealant on wet surfaces.

Where to buy?

In the UK, Adiseal products can be bought from Adiseal stockists. For other countries, it can be bought from online sellers like www.guglue.com who can ship worldwide.

What can you use waterproof sealant on

Adiseal is a multipurpose product that can outperform dedicated products. It has many different adhesive & sealant uses. Some examples include using it as a waterproof sealant for roof, tiles, plastic, metal, doors, felt & many other items. It can also seal leaking gutters even in the rain.

Paint on waterproof sealant

It is possible to use paint on waterproof sealant if that product is Adiseal. Most paints are suitable but it is recommended to test the paint first in a small area, if the paint is oil or solvent based. To test the paint, apply the sealant on a disposable item, wait for it to cure then apply the paint. If possible, wait to see if the paint peels of or not.

Frequently asked questions about waterproof sealant

What is the best external waterproof sealant?

Adiseal is the best external waterproof sealant. It seals instantly even underwater. It has high mould resistance. The clear waterproof sealant stays clearest when it was submerged in water for a long time. It is a sealant that also works in the rain.

Can you paint over waterproof sealant?

It is possible to paint over waterproof sealant if the sealant is Adiseal. Most paints are suitable to use. If the paint is oil or solvent based, it is recommended to test first.

What sealant works in the rain?

Adiseal works in the rain as well as in the dry and even underwater. It seals instantly, like leaking gutters even if there is rain outside. It provides a long lasting and flexible seal.

What sealants are waterproof?

Adiseal is a waterproof sealant that seals in the dry, damp, wet and even underwater. Most sealant require a dry surface for it to be able to work properly. This is not a problem for Adiseal.

Can any waterproof sealant be used as an electrical waterproof gel?

No. Standard sealant is not suitable for use as electrical waterproof gel. Electrical insulation gel is designed to withstand high voltage. It is also designed not to to set hard so that it remains re-enterable, in case the electrical connections need access to.