I have a set of Halibrand wheels and one has an annoying slow leak right in the center of the wheel. its not a rim or bead leak I'm assuming its a porosity leak. any thoughts or experience with sealing it up ? I was thinking of cleaning the inside of the rim and painting it with clear paint but not sure if it will flake off after time. I did some web searches and most are saying fix-a-flat. I won't be doing that !