I had 5 failures with the
redi-
pen, it seems I got a bad batch, where the product was mixing incorrectly.It is quite stressful when it fails, if feels like you have "wasted" something, but my wife is a nurse, and we were definitly mixing correcty. I actually gave up on redi-pen, and mixed myself (which is also an option).
In saying that, it may have just been dumb luck, perhaps the batches are better now?