had a couple where it has not worked where the hole is just too big to repair, but if you have a look in other chat rooms you will find more positive reports on k-seal than negative. I worked in the trade for years then moved into trading vehicles, I was the biggest sceptic out I tell you, they had to send me a bottle for free for me to try it and it worked! I have honestly been that amazed with the positive reports that I have even tried to buy the company but they won't sell it, understandably the product is great! Its around a tenna a bottle in most places its hardly unreasonable, if nothing its worth a try at that price. Also if you presume we leave off negative replies and only post the positive ones, there is still alot of positive ones! Maybe we should offer a phone a previous customer service so sceptics can call and find out honestly about the product! Its hard to convince people, I would be happy to provide it on a no work no fee basis but unfortunately that is to open to abuse.