"Ive used many roof sealants and although this is one of the more expensive, its by far the most cost effective option on the market. Quick & easy to apply and easy to spot any tiny bits you may of missed. Fast drying and no sleepless nights when it rains. In my opinion isoflex is the only option to consider. :)"
"used this previously on another garage roof, never leaked again. Prep the roof properly get rid of any loose/flakey impediments. Mark the area in 1m squares use approx 1litre per sq metre don't over work. Brilliant results but use throw away brushes and gloves"
"Cheaper by £10 compared to other DIY shops. Used this stuff to repair tears and holes in shed felt and the shed tongue and groove boards. No need to use clout nails , brush it on and lay the next piece of felt. If you do use clout nails brush some of this on top. Works every time and lasts.WARNING VERY STICKY. (If you're like me and seem to attract paint etc. onto your clothes) Wear your oldest clothes and throw away after the job. Have rubber gloves handy. Can be very messy but worth every penny."
"Used this over 20 years ago to repair my dads garage flat roof. Followed the instructions on the tin, filled cracks, cut stuck and nailed down blisters, then primed and gave it two coats. When dry covered the roof in white stone chippings. I read somewhere it lasted up to 20 years and it does plus some. My brother in law used to maintain all the seaside flat roofs for a council he only used this product and never refelted a roof. Highly recommended but use it only when its dry and once done if a bit leaks you only have to paint that piece of the roof. Do warm it up on cold days as it is thick and difficult to brush out. I have used it many times to protect wood, stop leaks on concrete,flashings etc.."
"After doing lots of research and looking at reviews I decided to buy a few buckets of this stuff to redo my garage felt roof. I simply poured and rolled it on top of the felt and it creates a perfect seal against all weathers. Much cheaper than completely redoing a felt roof and looks awesome too. The product is fairly thick so I would recommend putting the tin in a bucket of boiling water for 5-10 minutes to decrease its viscosity. Also give it a stir afterwards. Top stuff, highly recommend!"
"I used this product just over 20 years ago on a leaking garage roof. It wasn't clear where it was leaking from. It had bothered me for ages. Replacing the roof would have been expensive and then another leak sprung. I decided to go over the whole flat felt roof with Isoflex. It never leaked again. Last time I checked it still hadn't leaked. I'm glad I did the whole roof even though not all of it was leaking. It mended the existing leaks (wherever they were I never found out). It clearly stopped further leaks that would have occurred from happening.
The coverage will probably be less than the guidelines on the tin. So buy extra to have ready during the job on a return-if-not-used basis if you can. You have to cover the whole area you need to in one go keeping a wet edge like paint. It's tough to work as the product is quite thick so you have to keep at it spreading it and make sure none of the edges dry till you have got it all on the area you need to cover.
Choose your tin sizes carefully. Once you open the tin, any left over is not going to be usable at any later time. It's fiddly to use as anything it touches including your skin, it will stick to. I clothed myself from head to foot and covered hair, long sleeves and gloves, wore clothes and boots and used tools that I planned to throw away after the job. I can't remember if I wore a nose mask as well but I might have. You just won't be able to get this stuff off anything it touches.
I love this stuff and think it's worth every penny. Now I have another roofing job for which it's an option. Now that I've found this product is still on the market, I won't hesitate. It is an absolutely fantastic product and worth it for the DIY'er because it will definitely do the job if the money for the product is paid and care taken to follow the instructions carefully."
"Having read the instructions give the tin a good stir to even out the viscosity otherwise the heavier material is left at the bottom. Also best to use on warm or hot days and wear old gloves because it is very messy, more like tar.
Excellent coverage, fully weatherproof and I can fully recommend it, though substrate pre-preparation is very important for getting the best results.
"This is a great product on flat roofs or car ports.
The trick is to use it on a hot sunny day poor it on the roof and use a roller with a broom handle and paint.
It is quite thick so I would suggest getting it mixed well before you using it. If it's too thick to poor after mixing try get a bucket of hot water and pop the paint can into the bucket for 5-10 minutes to thin out then use.
It's great to use even if you have cracks in your existing roof just full them up and let the paint soak in, it will dry and waterproof it."
"This stuff is messy. It's thick and gloopy, so hard to paint it on accurately. If it gets on clothes, skin or gloves or anything else it's very hard to get off. WD40 helps. But it really prolongs the life of wood. I have used it at the bottom of fence panels, fence posts etc and it works great."
"I bought this for a small section of flat roof. It sealed the leak which was due to old and tired roof covering for at least 5 years if not more. Other products only worked for about 12 months. I later applied it to a much larger section which was costly but cheaper than replacing the roof.
It needs stiring throughout the application and use throwaway brushes. I'd also recommend wearing layers of gloves and covering yourself up. Make sure you use it all in one session as it does not keep.
Only given 4 stars because of the costs although I guess if it lasts 5+ years it's not so bad. The larger tin is far more cost effective then the smaller tin and Screwfix is cheapest by long way."