I didn't get a chance to use it on the Recaros or diffuser, but I am very impressed with the results I got using it on the tyres. I took each tyre off as I needed to clean the hubs and inside of the wheel so it made the application easier. It's been over a month since I applied it and the tyres are still looking black and water beading off nicely. I used it straight out of the bottle and applied one coat, the result was a nice matt finish which is exactly what I was after. It hardly looked like I used any of the product! A little certainly goes a long way. The real test will come in the winter when the rain makes a more regular appearance. I will say however the coating did take awhile to become touch dry, but when you're applying the coating with the wheels on the car, that really doesn't matter much. I would love to know what you used to apply the product on the Recaros, and especially the tyres. I used the soft side of a washing up sponge and by the end it had broken apart Perhaps I used too much pressure to ensure the coating was applied to the tyre wall as there's a lot of writing on the sidewalls or maybe the sponge was crap!