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Isoflex Liquid rubber Black Roof sealant 4.25L

Was £50
£20
Save £30
£4.71 per L
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Product Details

Product Information

Features and Benefits

  • 5 times more flexibility than conventional bitumen's

Health and Safety

Please note that this item has additional safety or regulatory datasheets available. The product may have possible health and safety hazards covered in these documents. Refer to the container for full information and always follow the instructions.

Technical Specifications

BrandIsoflex
RangeLiquid rubber
Colour descriptionBlack
Coverage1 m² per litre
Drying time24 hours
ContainerTin
DurabilityEffective for 20 years
ApplicationBrush
Product code5010214567027

Reviews

(16 reviews)

Isoflex is a con. A rubbish product.

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J11ames0208 - 1 year ago

I have a fibreglass roof on an RV motorhome. Right so think of this products name. Yep it has FLEX in it. So with no walking on the roof and the vehicle parked stationary for nearly a year you'd think that it would work yep? This product was copiously painted onto the roof. Several layers and then within 2 weeks the roof leaked. I was up there today and the stuffs got hairline cracks in it too. No FLEX at all. The only product that works is RESIN. Yep from a fibreglass manufacter. CFS to be precise. Paint it after adding the chemical to dry over the roof. Then get up there after resin dry and using sharp scissors cut out fibreglass mat. Lay it down on the roof and once it all fits to form a cover to the roof remove some out of the way and then paint more fibreglass resin underneath on top of the freshly dried resin. Then lay the fibreglass matt back down on the fresh wet resin and paint more resin on the top. It will soak in and then go over the roof doing the same. Once dry, paint it with top coat for fibreglass from CFS. The stuff is used to paint boat decks with. Impervious to sea water and everything. Made a shower tray from fibreglass and top coat. Used it at least a hundred times. Fibreglass your roof and keep away from rubbish products like this ISOFLEX.

Isoflex is just rubbish. Fibreglass takes some time but guaranteed to last 25 years easily. Any fool can learn how to use it. Loads of videos on youtube. Its a doddle to learn. Follow the instructions given and you'll love my advise.

excellent but £10 cheaper elsewhere

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paul 59 - 2 years ago

this paint is worth every penny covers well and makes a great seal

Can't recommend enough! Magic in a tin!!

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DIYDudeDurham - 3 years ago

Spent quite a bit on a garden office / summerhouse but after having a wood burner and flue put in I developed leaks from the pitched felt roof, the fitters must have fractionally damaged parts of the roof. Impossible to find where the water was actually coming from, so opted for liquid rubber to coat the whole lot. After reading reviews for various manufacturers ISOFLEX stood out as being the best.

It is expensive compared to some others, but you get what you pay for and I want the job doing right and last for years.

Applied it during a dry, mild winter day, so benefited from dropping the tin into a bucket of hot water for 10mins to loosen the liquid within. It's hard work to paint on, so definitely needs a help to thin it out a touch.

Used a new fence brush, which quickly stiffens about half way down the tin, so if you're using a few tins you may have a couple of brushes to hand. These are non reusable as they get destroyed. Be neat when working as it won't come off anything it touches, so definitely long sleeves and rubber gloves recommended.

Definitely needs a really good stir right down to the base, as the thick rubber agent just sinks to form a base at the bottom third of the tin. Even with a decent stir there's still a reasonable amount still sat at the base.

The liquid dries quite quick and what an amazingly durable finish. It's like a thick coating of plastic on the roof now, water just sits on it as beads after the majority has slid off. Since painting it not one drop of water! I can't see that changing for a good few years either.

This stuff is amazingly good. Highly recommend!

Not every B&Q has it, those that do only have a single tin on the shelf, and they won't deliver it, so not the easiest to buy.

Use of ISOFLEX High Performance Liquid Rubber

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SeanfromBurton - 4 years ago

The flat roof on my porch had developed a leak to the point I had to put a bowl on the floor during heavy rain. After probably a couple of month of ear ache form the better half, I though it was about time I tackled the problem. After inspecting the roof I noticed a 50mm crack in the felt, which was roughly where the water was coming through the plastered ceiling. I looked on line for products that claimed to repair leaking flat roofs and I came across ISOFLEX High Performance Liquid Rubber. I'd used FLAG Roofix before, which appeared to work well, however after 2 years the UV from the sun had hardened the epoxy making it brittle and it began to crack and fail. Therefore I decided to try another product to see how it faired. I tried several places to compare prices and to my surprise B & Q were the cheapest and to be honest I wasn't expecting that? Whilst purchasing the product I read the label and it stated that you needed to use the ISOFLEX primer before applying the liquid rubber, this added an additional £10 to the job, but I bought both as I didn't want to compromise on the job.
I followed the instructions on the primer by cleaning the flat roof of loose material and giving a good clean. The primer was very thin and was applied with ease leaving a slightly tacky surface. After removing the tin lid from the ISOFLEX liquid rubber I found that the product had separated whilst been sat on the shelf in the shop, to a hard thick treacle substance taking up about a third of a tin, and a very thin black liquid filling the rest. This took some mixing with a strong stick, in fact I used a toy cricket stump I found in the garage which was about 22m round. It was very hard work mixing the product and it took me at lease 15 to 20 minutes to completely mix the product, it was an arm burner to say the lease, but the product eventually was one thick consistency. The mixed product was easy to apply and I only used half a tin covering approximately 3m². The finish was a black smooth, rubber like finish, which has been down for a week. We've had some heavy rainfall since application and all appears to be well and doing the job.

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Ants53 - 4 years ago

This is a really good product well worth the money and sorted the problem out

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