At the Autosport Show all cars - TC, F1 and GT12 - used Spider Green additive. Grip was fine. If you are racing foam tyres at a club with oil-based additive, then Spider Green works just fine. You must clean your tyres off with brake cleaner after the meeting so they don't rot away in your box.
I don't know if using Spider Green on rubber tyres would be the same result. The best thing is to go there with your Spider additive, apply it as normal and see what happens. I doubt it would be a disaster. Try both types of additive on clean tyres and see what the lap times say. You are looking for the smallest gap between your fastest lap and your average lap.
Just looking at the fastest lap is no good, you want the additive that is the most consistent across the run so checking your 'gap' is the best indicator. That will soon tell you which is best for your driving style.
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