you will always cuss and cry!!
thats why i like the urac- i feel that it is a bit more forgiving- i doesent mind the slight gap- so you dont over clamp- thus creating glue dry areas, and its very easy to work with.
c clamps can sometimes be a problem as pressure is very specific to the clamp site- there is not as even a pressure distribution as other methods,
like the inner tube wrap- (i use a form and elastic bands)- the clamps can lead to dry spots- especially when dealing with thin backing strips.
dont give up now- get straight back in the saddle.
g'luck
wayne.