I have some 28JBs that have been on and off the car in maybe half-a-dozen meetings since the autumn. Still going strong. My additive routine is to give them a good soak at the start of the meeting (Nosram carpet, 20-30 minutes, reapplying to keep the tyres wet, wiping before going onto the track of course).
Then during the meeting I have stopped re-applying additive, I just clean with motor spray. I find that the tyres can become greasy if too much additive is applied during the day. I don't have warmers.
PS the car can feel a bit different on very fresh tyres, but they aren't really much quicker unless you are national A-final standard. It's worth adapting your setup to work on worn tyres rather than needing that new tyre boost all the time (which only lasts for about one race!).
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