One time I recall, and will share some basic info, I had a good amount of CQuartz UK left which was expired quite a bit.
One opened and half gone, I think a 30ml, and another 50ml unopened. Used them both on my 6x12 cargo trailer.
I tried the fenders first, and tried using it in a traditional method, spread and then come behind and wipe right after. Nope, no good. It spread fine with the MF Suede Applicators with Block Sponge, but wouldn't tolerate the after-wiping.
So, I skipped the final wipe. Here the product leveled just fine, looked OK, I wasn't striving for show car results on a 14 year old Trailer, just good protection. I achieved that.
With this said, and if you should find it not working well on some small test areas for a vehicle, then instead of tossing such an expensive product, use it for other around the house uses,
Lawnmowers, the kid's Bikes, ATV, etc.
There's been personal instances (twice) with DLX where I found it didn't like to be wiped after either. Just apply on prepped surfaces, and then maybe don't touch after to level-smooth.