HPRS25L 2.5L Thompsons High Performance Roof Seal - Black

Have used this recently. It was easy to use not like the bitumen based sealants I've used in the past. It seems to be perfect for sealing any leaking flat roofs only time will tell if it continues to do the job but so far this is the best roof water sealant I've ever used.

I have a flat roof above my kitchen that has not given me any hassle until recently when there was a thunder storm after a particularly hot dry period. The roof leaked and water poured into the kitchen ceiling and down the light fitting onto the floor. Luckily I did not turn the light on other wise I would probably have been frazzled in a Scooby Doo type, hair sticking on end and bulging eyes kind of way. Having phoned three local roofing companies, none of whom turned up to quote for the work, I decided to take matters into my own hands and, after watching a couple of YouTube videos, I decided that a sealant was what was needed to repair the thin worn roofing felt. Having gingerly climbed onto the roof through the window to the spare room and decided that the roof would be able to take my weight and I would not be disappearing into the casserole pot which was bubbling away on the stove, I inspected the damage properly. It seems that what had happened was that the roofing felt had worn so thin that it had become porous along the edges of the roof timbers that were spaced every 10am or so. I was tempted to pour a bucket of water over the roof to test this theory but decided against it as I did not want dirty water in my chicken casserole. This tin of roof seal arrived promptly with easy to understand (even for me) instructions and a plastic lid that was easy to open. It seems that this product needs no stirring (I didn't stir it up anyway) and is fairly order less. At first appearance the substance in the pot was grey rather than black as claimed, not that I was concerned about the sartorial qualities of the liquid too much, more of its ability to stop my ceiling from leaking. I had found an old paint brush that had been used before and had cleaned up reasonably well and started to apply the paint to the roof. Being so dry, the roof soaked up the paint very hungrily and seemed to drain my brush as soon as it had made contact with the horizontal surface. I had selected a brush around 10cm wide that could fit into the paint pot tub to charge the brush in one single dipping motion which was more efficient than getting a wider brush that would have required dipping at each angle to be fully charged. Sensibly, I started at the very edge of the roof and tried not to look down too much at the patio furniture below that would probably have broken my fall along with several bones in my body. I went as close to the edge as I could stomach and even managed to clear some leaves out of the gutter before applying the paint to the rough felt. The trick to this is to make sure that the paint is evenly applied and that no area of the roof is missed which is not as easy as it sounds when you are on your hands and knees on a roof in the blazing sun with a chicken casserole on the stove in the kitchen sending up even more heat. I elected to do this bare foot so I could be as fleet as possible and also shirtless so I didn't spoil one of my shirts. My shorts took a bit of a hammering though and they looked pretty splattered at the end, I do not expect that this stuff washes off and I am not going to try as I quite like the effect which is an added bonus. This is quite hard on the knees too, particularly on the rough bits and the bits on the felt graze against knee and heel tissue quite fiercely. After around an hour the deed was done and I inspected my efforts. As the paint dries patches form and it is clear that some areas are maybe too thinly coated and it all looks a but disappointing at first but as the solution evaporates further the surface becomes clearer. This is pretty intense stuff and if the degree to which it sticks to your skin (I got a lot of it on me rather than the roof) is a reflection as to how well it sticks to a roof then it is very good stuff indeed. It comes with a 10 year guarantee which seems impressive, however I cannot imagine many people will have the receipt or the aptitude to challenge this if, say, in 8 years time there is a leak would you really a. still have the receipt, b. be able to prove the leak had been caused by the product c. know who to contact to complain d. go to all this bother for something that had cost around £20. I think not. At the very least I have saved on the cost of a roofer coming out even though the experience has cost me around £20, a couple of hours of my life and several layers of skin on my knees. By the way, it was too hot to eat the chicken casserole and I had a salad instead.

The only reason I did not rate longevity is that I only today applied this roof seal. The first thing to notice is that it was a stylish charcoal colour rather than pure black. Easy to apply. It does make me feel more reassured about my shed roof.

This stuff is brilliant, did my mum's garage roof.. Works very well and stops any leaks..

Brilliant stuff.Lasts for years.Easy to apply

My garage was a hovel. A shell. A poor mans attempt at a structure. Sure it looked the right shape with its badly fitted roller door and its cobwebby back window. These were things I could live with and live I did, pottering around manfully eyeing the walls and dreaming of tall shelving units and large tools to stack on them. Then it rained. As the rain drummed harder on the roof I was snapped out of my man tool reverie by the pitter patter sound of water spashing joyfully onto my floor. I turned and was aghast. Water was slopping down in big fat drips from two locations in the roof. My heart lay heavy in my chest. There would be no cheap metal shelf units banged up against these cold brick walls until my garage was dry enough to keep the finest of things in. Days later the weather turned and the day shone sunny and bright. I had already purchased Ronseal's ten year roof sealant and the big red foot ladders from Amazon in preparation for this day. Within moments I was on the roof looking at the shoddy work that had been done before I purchased this travesty of a tin box. The roof was flat chipboard with a very mildly sloping corrugated iron covering. It was shoddy. A child could have done better. I could see the stains of various sealants that had been used over the years as well as the dried feathers and sticky bones of offerings that had been made to the gods when these poor fixings had failed. Well off I went. I opened my tin of sealant and my inner man nodded his head in approval at the grey gloop that roiled within. It was obvious where to slop the stuff as I copied those unfortunate sealant-o-nauts who had gone before me. In no time I had covered their work with my exceptionally easy to apply sealant and had two thirds of a tin left. Well when in rome they say so I slopped more on, then more still. In fact everywhere that looked even slightly suspect I covered in sealant. Eventually I felt I had done enough. Most of the roof was covered (Its a big garage too) and I had even covered a large portion of my arms and face. Now it was time to wait. And wait I did. I stalked the weather, praying for rain when fools prayed for sun. The clouds defied me with their fluffy snide 'O' shaped mouths. Flatly refusing to be darker and angrier and pour down the rains that I so craved in the small hours. Then some ten days after the sealing as I unpacked some shopping it happened. The rains fell. Not just rain but proper sky machine water. Smashing down through the air like aqua racing cars on a translucent track. I ran to the garage and threw myself into my old man chair and gazed at the roof where it had wept its poor garage tears before. Nothing. The rain drummed harder. Nothing, the very aridness of the garage parched my lips. The rain lashed the garage like a ship on a stormy sea and yet nothing leaked. The old garage creaked slightly and settled, I could almost hear her imaginary sigh of contentment as I stood and patted her faithful walls. "Dont worry old girl," I whispered. "I'll take care of you".

Excellent product, stopped my shed roof leaking 😃

Purchased this to seal the flat roof on my garage. Got this after reading the reviews. It's excellent, but easy to use and did the job