Ok I run 100 psi on my tubes and are finding that the patches should be round in shape so as the tube expands it does it evenly around the hole in the tube. I am applying my glue to be as thin as possible as not to trap any undried glue under any thick areas. And I am making sure that the glue is even and is as flatly distributed as possible as not to allow any "canals" where air might escape through. Sometimes I notice some areas of the dried glue surface to not have as much glue, this may be caused by the "sticky stuff" not being dissolved as it should have been in the container. I am not using any vulcanizing glue because I have not found any and am using elmers rubber cement and a cut up old tube, to be as cheap as possible. What have you found to work best for you? Thanks.