Jeep trim and C4 - PakShak Auto Detailing Forum
Kean said:....well, all I can say is that my remarks are from my own observations when using the product. In situations with heavier oxidation and where the finish was uneven (patchy contrast), this pattern would still show through the product after application. On the Avalanche I spoke of, this was certainly the case.
Even after thoroughly cleaning an area with an APC and doing a final wipe down with IPA, it simply wasn't enough. However, with some time and effort (and a lot of scrubbing), I was able to clear up a small area and C4 did work well on that. In fact, that was my game plan although I knew it would take me several hours at least to get the rest of the surfaces to the point I would feel confident enough to apply the C4. Granted, I didn't use a water spot remover but I also never saw instructions from G/Techniq that recommended the use of one. Also, I have doubts a WSR would have made a difference considering the effort I put into restoring my test spot.
I never got around to starting that project because I simply didn't have the time. Fast forward a while later and ETR began sounding more like the solution I might be looking for in this type of scenario (many thanks to Ron for filling me in). I just don't see C4 as a strong restorative solution in these types of cases. ....not without at least partially restoring the surface first (going beyond the basic prep).
Having said all of that, this is not a slam on C4. I still think it's a good, durable, long lasting coating and its what I am currently using on my Challenger and bits of my Forester. As I said a couple of times already, this is all my opinion and personal experience. ....YMMV.