Inner tubes DO NOT hold pressure, tires do.
I've never been a fan glueless patches, they seem to high failure rate.
Vulcanizing patches as mentioned by sixtyfiver are the best way to go.
Make sure your tube size is very close to your tire size. Running an 18-20c tube in 28c tire is bad. As the tube streches to fill the tire the patched are doesnt stretch as much and stresses the patch which can lead to patch failure.
Its a sad day when some of you believe there's such a thing a fixie specific patches. Back to tricycles for you!!