Bump from the thread originator.
UPGP durability is directly related to application. Worst case 2 months or so. Best case a PA winter. Prep well, use UPPP, and multi-coat with at least 12 hours between coats.
Ultima products I still use: UPGP, UTTP, UIGP, UPPP.
I still use UPGP on most of my details. With the exceptions being FK1000P and Black Diamond Paint Sealant.
I use the UTTP on everything it is recommended for, though I find that once it has dried overnight on the tires, a coat of Black Diamond tire gel adds a nice look and significant durability.
I use UIGP and UPGP for interior plastics and trim.
The exception being leather. For leather I use the Lexus brand product to condition and 10:1 water to Woolite HE for cleansing.
Oh. One other exception I recently switched to Einszett Gummi Pflege for all door seals. It is a pretty amazing product.
I find that after a complete detail full polish when I am otherwise ready to apply my LSP, I finish with a red LC pad using a FLex and UPPP. Kind of like jeweling but less for appearance and more because I find that it significantly boosts the durability of UPGP. By a factor of a couple of months.
For my exterior glass I clean with Aquapel glass cleaner and seal with Aquapel. I clean my interior glass with Stoner's.
I use a variety of polishes. Menz, Megs, and 3M (I favor the 3M more every year).
Pads are always LC CCS.
MF are a mix between Sam's club for the silly stuff and Megs.
I wash with P21S concentrate for the tough spots and foam canon Optimum shampoo with a MF glove and pinnacle bug sponge.
Clay with diluted ONR and Pinnacle poly.
I like FK for my QD.
I use Adams undercarriage spray dressing for wheel wells.
I use a Flex (6.5" wheel) and a Makita rotary (4" wheel). I have a PC but rarely use it.