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Good tip when spraying wheels with tyres fitted is to buy a deck of cards and slot them in between the tyre and wheel overlapping slightly each time, avoids overspray to the sidewall, the masking tape doesn't really stick well to rubber.
I saw this on wheeler dealers a while ago, i read up about it on their website and found a few people on club forums talking about it, but i didnt find there was enough evidence to actually prove it works and improves the engine!!
If you do decide to go for it, try and get and do some tests...