The best gutter sealant in the UK will be one that can be applied in all weather, has years of durability and is ultimately good value for money.
Get your choice wrong and you may find that the sealer hasn’t bonded to your gutters properly and you’ve wasted your time as well as effort.
So what can you do to make sure you make the right choice? Well, it’s simple: you leave the choice to the professionals! With years of industry experience, we’ve used many gutter sealants in the past and know which ones cut the mustard and which ones are better off in the bin.
Of course, you don’t need to take our word for it. We’ve also combined our knowledge with thousands of real-life customer reviews just to make sure that even amateur DIYers are getting the same results as us.
With that being said, let’s take a look at our choices for the different categories.
Quick Look:
- Best Gutter Sealant Overall: SealFix
- Best Gutter Sealant Spray: PDL
- Great Gutter Sealant Paint: Polar
- For White Gutters: Everbuild
- Best Cast Iron Gutter Sealant: Evo-Stik
Best Gutter Sealant Overall: SealFix
When considering factors such as adhesion strength, durability, how waterproof it is and overall value for money, it’s hard to choose anyone other than SealFix as the best gutter sealant overall.
This gutter sealant paste creates a permanent elastic sealing compound with dralon-carbon-fibres. This is particularly advantageous because gutters tend to expand and contract depending on the temperature so having a sealant that is elastic is going to ensure your gutters remain sealed at all times. Of course, without that elasticity there’s a good chance the sealant will separate from the gutter over time.
We also like the fact that it’s a paste. Whilst some people will prefer spray (which admittedly is much quicker), a paste that can be applied using a paint brush gives you that added accuracy to ensure you definitely seal any holes or cracks.
It’s also an incredibly versatile gutter sealant and can be applied to a variety of substrates. That means you can be sure that whether your gutters are made from plastic or cast iron, it’ll do the job.
Pros
- Can be applied by brush, giving you more accuracy
- Is an elastic sealing that is able to withstand natural contraction and expansion of gutters
- Will adhere to any substrate making it a universal gutter sealant
- Is double the size of other sealants so you’ll definitely have enough
Cons
- None
Final Verdict This gutter sealant is simply perfect for the job. A must-buy if you have any guttering leaks.
Best Gutter Sealant Spray: PDL
As mentioned above, we love using sealant that comes in paste form but sprays can do an equally impressive job, especially if you use PDL.
This bitumen cold joint sealer is an adhesive spray that has such great performance that it can be used to seal tarmac. Of course, you’ll be using it on your gutters where, once sealed, combats moisture easily and is instantly waterproof.
Like SealFix, PDL’s spray dries to a flexible finish and thus is able to cope with the demands of gutter expansion and contraction.
Of course, the obvious benefit of using this is the fact that, as a spray, it’s very easy and fuss-free to apply with next to no mess.
Pros
- Easy to apply spray
- Dries to a flexible finish
- Instantly waterproof and remains weatherproof for years
Cons
- Is less accurate than a paste formula
Final Verdict If you’re looking for a quick and simple way to seal your gutters, try this gutter sealant spray.
Best Gutter Sealant Paint: Polar
If you’re looking for a gutter sealant paint, you don’t need to look much further than Polar
Polar’s gutter sealant paint is ideal for application on any gutter material and will waterproof them instantly.
Perhaps the best thing about Polar’s gutter sealant paint is the fact that it comes in either a black colour on clear. This means you can paint your entire unprimed gutters black with it to make them look brand new whilst completely sealing them in the process. Of course, if you only want to seal gaps and cracks without painting your entire guttering system, the clear paint will come in handy.
Pros
- Works instantly to waterproof your gutters
- Easy to apply and doesn’t need a primer
- Acts as a paint and sealer in one
Cons
- Whilst this paint is fairly durable, it’ll only be a short term solution
Final Verdict This paint will seal and simultaneously breathe new life into your gutters.
Best White Gutter Sealant: Everbuild
If you’ve got white gutters, it should go without saying that you’re going to want to get a white gutter sealant
Working as a sealant and adhesive in one, this white gutter sealant has an incredibly quick curing time of just 30 minutes.
Using hybrid polymer technology, EB25 combines silicone and polyurethane to form an incredibly high strength and sealant that is resistant to mould and has no trouble being submerged by water. The fact that it’s flexible is an added bonus.
Pros
- White colour suits white gutters
- Dry in just 30 minutes
- Mould and water resistant
- Can be painted over
Cons
- Doesn’t last as long as some of the other sealants on this list
Final Verdict If you’re looking for a white gutter sealant, Everbuild’s EB25 is the one for you.
Best Cast Iron Gutter Sealant: Evo-Stik
Whilst we could have easily put SealFix as the best for this category (and a lot of the others, actually) we thought we’d go for something that is more specific to cast iron gutters so that’s why we’ve chosen Evo-Stik.
As anyone with cast iron gutters will know, they can be particularly prone to minor leaks here and there. Unlike thin PVC which can slot together easily, cast iron gutters are susceptible to gaps.
Fortunately, you don’t need to change your entire guttering if you do find you have a leak. Simply pop some of this gutter silicone on and you’ve saved yourself a fortune.
This silicone works by sealing any gaps and will easily bond your cast iron gutters together. The low modulus, neutral cure silicone has been formulated to have a high degree of flexibility so any sudden movements of your guttering shouldn’t cause you any issues.
Perhaps the best aspect of this cast iron gutter sealant is the fact that it’s so durable. Being labelled as made for the trade, you could potentially get 25 years of protection out of it.
Pros
- Works well on cast iron gutters
- Long lifespan saves you lots of money on expensive repairs
- Highly flexible
Cons
- None
Final Verdict If your cast iron gutters have started to leak, try this gutter sealant before commissioning expensive repairs.
Gutter Sealant Buyer’s Guide
Flexibility
Flexibility is one of the most important factors you should consider when buying a gutter sealant. Not only will gutters physically move due to the weather, they’ll also increase and decrease in size.
This is especially true when exposed to UV which makes plastic gutters expand before contracting again. If the sealant doesn’t expand with your gutters, it will stop protecting them and will reveal the cracks/gaps again.
Compatibility
Before buying a gutter sealant, you’ll want to check if it will actually work on your gutters. Whilst most UK homes will have plastic gutters, if you have aluminium or cast iron, double check if the gutter sealant works on those substrates.
The last thing you want is to waste time and effort applying something that’s not going to adhere properly leaving you back to square one.
Durability
Durability all depends on what you’re looking to achieve from your gutter sealant. If you’re after a quick fix, then obviously you don’t need to worry too much about durability and can probably get away with buying something cheap.
Conversely, if you want a long term solution, high durability options should be high priority.
Price
Not all gutter sealants are made equally and with that, not all gutter sealants are priced equally either. As the saying tends to go – you pay for quality. If you’re looking for a long term solution, don’t shy away from paying for the premium products. After all, having your gutters replaced will be far more costly so if you can buy a sealant that will last years for £20, you’re laughing.
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