That is a real tricky and most of the time unsucessful way to install a patch.IF you are trying to seal a spring that changes its direction of flow under pressure.I have had some good results by using a liner to patch a spring that does that if you know the location of the spring and can place the patch over it then weight it down with something I like to use #2 stone it is successful most of 3 times I tried it the only time that it didn't work is when I didn't get over the right spot and it folded up on me leaving about half of the hole exsposed.If you try it let me know how it works for you DOC
