Originally Posted by
Unknown Cyclist
A glueless patch is far more likely to leak when the tube is inflated outside of the tyre.
When the tube is inside the tyre the air pressure pushes the tube against the patch, so overinflating the tube outside of the tyre is likely to provoke a leak that otherwise might not exist.
Right. That might be the case, but because I couldn't find any other leaks in the tube, I concluded that it was the glueless patch causing the slow leak.