GoopPuncture Preventative/Proofer/Treatment 500ml Bottle

I had a slow leak from one tyre on a 20-year old Passat (205/60-R15). Most likely the surface where the tyre bead sits and seals is corroded. At £60 to refurbish the wheel, I decided to spend a tenner on 500ml of this to try it instead.(I have also heard that alloy wheels can become porous with age - but I am not certain about that). I was losing pressure for 2.1 bars to 1.0 or less in 4-5 days.To add the Goop, I jacked the car up to make sure that the tyre was not being flattened by the weight of the car. I let all the air out of the tyre and removed the valve stem. If you do not remove the valve then it can become clogged with the Goop. By replacing the valve and then inflating the tyre, the valve is kept free of any of the Goop.I transferred all 500ml into the tyre, as per the instructions whch were simple to follow, I replaced the valve and inflated the tyre to 2.1bar. Including jacking up the car it took me about 10-15 minutes to do all of this. Although the instructions do not mention this, I then drove the car for 6-7 miles to circulate the Goop around the inside of the tyre and wheel.10 days later, the tyre has not lost any pressure at all.I am very pleased and I think for the cost, I will buy a litre bottle and put Goop in each of the other 3 tyres.I highly recommend this!By the way, to re-inflate my tyres I used this compressor, it is excellent and convenient: Ring RAC900 Heavy Duty Tyre Inflator, Air Compressor with 7m extendable airline, brass connector and storage bagEDIT 11 November 2018: I have now driven several thousand miles, including 6 long trips of 650 miles each - with no loss of pressure in the tyre that previously had a slow leak. This product is excelent.

EASY TO USE, WORKED WELL, GOOD VALUE AND PRICE

It was a close one between giving this a 4 or a 5. I have a 12 year old car with original alloys and all four leak to a certain extent (ranging from every 3 or 4 days leakage to a month or so) around the corroded rims and I am too much of a tight-fisted Yorkshireman to buy new alloys or get them refurbed so thought I'd give this a try. Firstly, the application process was easy. There is a tool in the top of the cap for removing the valve. Be careful if you only have one bottle as I snapped the first one. ooppsh. but that was a sticky valve. the others came off easily. the process of inserting the green gunk into the tyre was quite a sensual experience. I really connected with the tyre and the implanting of this green lifeform. I pretended that it was really some kind of alien I was putting into a secret repair mission ... but yes.once done I pumped the tyres back up and for a week or so 3 of the 4 tyres were rock solid. no air loss whatsoever. the one tyre that loses air after 3 or 4 days was still doing the same. perhaps it has gone past the point of no return in terms of goop infiltration techniques. I have resigned myself to pumping the tyre up every few days until I get lucky and find a replacement alloy wheel at the side of the road.I also used one bottle per tyre. So to summise I would recommend this for slow air leaks of maybe 3-4 weeks. Anything that goes down within a day or two I wouldn't. It might also be a good idea to have one of these spare in the boot. haven't actually used it for a puncture repair but can see it being useful. especially if you don't have a spare in the boot.

I had a slight weep on my nearside front tyre that would lose about 4-5 PSI over a few days and I could never work out where it was. Bunged this stuff in and it's held perfectly since. Was really easy to do as well, took about 10 minutes total, although I'd recommend buying a valve removal tool, as the one built in to the lid snapped straight away. I bought a little kit that had tools in and spare valves for about a fiver.Also works perfectly with the TPMS on my Astra GTC.

I am sorry to say I cannot recommend this product.I had used goop in my motorcyle wheels for a number of years as a puncture preventative measure and always put it in when I fitted new tyres.I also recommended it to others.. until now.My bike was off the road for about 18 months (parked in my garage) and when I started using it again I noticed the tyres started going flat every couple of days.I thought I would put some more goop in but they still kept going flat.I took the tyres off the wheels and then found the problem...the old goop that had been it there while it was off the road had dried and corroded approx 1/3rd of the rims, which I assume would have been at the bottom while the bike was parked.My thoughts are that the goop had run down and dried in this area. The wheels had a number of approx 10mm diameter craters some of which were as much as 8mm deep with semi dried green goop in them. This area was also missing much of the paint and was showing signs of corrosion. The edges of the rims were also badly corroded where the tyre bead sits, so the tyres would never seal against the rims. I tried cleaning up the rims but they were too badly corroded and pitted and I was not prepared to risk my life riding on rims with 8mm deep craters in them.I had to replace both wheel rims, fortunatley I was able to find some second hand rims for a couple of hundred quid for the pair, other wise it would have been about £500 per wheel or more for new ones from the dealer.I will never use this stuff again.Goop claims not to damage tyres or wheels but I found this was not the case.It may be ok if you change it regularly but if it dries in the tyre it may rot you rims ...be warned.I have attached a few photos of rims. One photo shows what would have been the top of the rim when parked and you can see there is no damage and the rim is in good condition in this area. The other photos show the "bottom" area with the damage. You can clearly see the dried goop.