Well, yerterday I tried 09374 in a Seat Leon, 6 years old, never polished, lots of swirls. As I know 09374 cuts a lot, then I tried using it via PC to check if with 1 pass I could leave the surface swirl-free and to check the finish. I polished with a yellow cutting Propel pad for 1 min and a half and the surface obtained was 100 % swirl-free. The finish wasn't bad, but some (normal for this compounds) hazing. I followed it with 1z MP via rotary and the result was amazing. Then, I love this process. You can cut very fast and leave the surface swirl-free and then achieve the better gloss with a nice finishing polish like 1z MP, Menzerna Final Finish, etc...
What I loved also of this 09374 is that the abrasives break down very fast, you don't have to work the polish lots of time. Before I tried 09374, I used #83 via rotary and a Edge polishing pad and it took lots of time to break down, without leaving the surface swirl-free but with better gloss thant 09374. Yes, I know that both polishes have very different aggressiveness, but I was trying to achieve the same with them by using different ways to compare the results.
What I didn't love is that you can smell the solvents (naphthas), and I read in the label that you must use it in a well ventilated room, then I'll use an appropriate mask because my garage isn't very big.
I'll try 09375 and 09376.
Do you know if OHC breaks down fast? I know that the working time is "infinite" but, does the abrasives work since they touch the paint like I tried to describe here?
Thanks !!