Bests & Worsts Reviews from Amazon

This is an excellent product when used following directions. If it did not do the job for you then I suggest you reconsider your approach. Why would I say this? I had to tackle multiple active leaks on an outdoor fire hydrant-like bit of plumbing (we bought the house a couple of years ago and this is how the outdoor water supply was engineered). The unit had developed multiple active leaks. The water pressure comes directly from the main water supply. The leaks were on the order of 1/16 inch holes actively leaking (in one case like a mini-faucet). First, clean the surface well. I used dish soap followed by 70% alcohol with rough sponges (i.e., get all oils/grease off). Then sand the surface. Knead the putty as described. Make sure you knead it to a homogeneous color (I think the package says grey but to my eyes it was white), err on the side of too much kneading (I found about 3-4 min of active kneading is ideal for the whole roll; Also I would suggest cutting the roll in half longitudinally then braiding the two halves and starting to knead. This will assist with the mixing of the core and shell components). When ready it will also start to smell like stale urine ... think peeing a toilet for a week without flushing, get the idea? ;) Use a volume of the waterweld that you'll be able to apply good pressure to without it thinning out too much. As I mentioned I was "fighting" active leaks. I learned that for this type of problem you have to apply the waterweld to the leak and then apply constant pressure for about 7-10 min so that it starts to set and can resist the water pressure. If not, the water pressure will cause it deform and bubble eventually thinning it so much that it will develop a hole. I applied pressure manually. Not fun to do but it worked. Also, make sure that you push it down firmly around the edges so at to obtain good contact. Once set I then applied more the sides and on top just for good measure. In conclusion, when used with proper preparation of the surface, kneading and application it worked great against active leaks from the main water supply. Finally, gloves would be a good idea, but I found that it made manipulation hard for me and therefore worked with bare hands. If you wet your hands it will also make manipulation easier and in my case, as I had to apply manual pressure for prolonged time periods, decrease the putty sticking to your hands. As I had multiple leaks to contend with I ended up with encrusted hand. To remove dried putty from your hands I suggest using acetone. I soaked triple layered paper towels in acetone, then wrapped around my hands and left in place for 30 sec or so and then used the soaked paper towel to scrub the putty off my hands. Wash hands well with water. All done. Waterweld is great!