I have just completed 5 weeks or 25 rounds of radiotherapy following a mastectomy. I was fortunate enough to have been told about this amazing Strata XRT gel which I used twice a day during treatment...
I was in the public system and asked about Mepitel. Was told that they had some in the cupboard but never used it. Nurse was happy to give it a go (not sure the later nurses were quite so keen as it does take a little while to put on). I had no skin breakdown and just a small sore red spot that appeared 3 weeks after treatment, on the tender skin on my side - from memory, I don't think the film went around quite that far.