Hi Weka,
The spray plaster can be seen
here. It works fine for me but my skin on my hands and feet is very thick. I take the excess skin, which builds up on my heels, off with a pair of scissors.... Mrs S and #2 Grandson have had issues with it burining and blistering them. I'm sure it depends on yuor skin type and you would have to test it on a very small patch. It certainly stings when it goes on.
My foot is tender but recovering. I find savlon works for me extremely well which is why it is one of the "liquids" I always travel with. There is no swelling or inflamation and there was on Satruday evening which is when I looked at it. The nail was celean as it had been used just the week before and pulled out of the wood it was holding together. My tetanus is only 3 years old as I nearly carved the knuckle off my index finger 3 years ago and when they tested me I had no protection.
When we first bought the house in 2002, one of the first things we did was to pull out oil fired boiler which stood int the hall and the parrafin tank which was "inside" the house, in the garage and only 10 feet from the boiler through a flimsy tongue and groove panelled wall. When Mrs S stopped in on the way back from our Ball in Freiburg in Feb 2013, it was -10 and she spent the whole time in the living room with a roaring fire going and the settee pulled in front of the fire.
Over the years we have completely sealed and insulated the house. Which started with rickety doors at the ground floor, garage, level and ended with a normal internal house door to the attic and a completely open attic roof. The only way to keep any heat in the house was in any one room and that is where the radiators/fireplaces and stoves were.
Yesterday half a dozen half meter logs, kept the whole house overwarm most of the day.