Looking at these 3 products, do these all have the same function-a long term sealant?

From what I gather, sounds like all 3 can be applied at the end of detail, including over a cured layer of carnuaba.

Has anyone had experience in durability between the 3?

I plan on doing my friend's RSX-S and he's the type to not really wax his car-just runs it through the wash. So I am looking to do a thorough claying, swirl removal, glaze and sealant, then top it with a carnuaba.

Do these products dull the LSP or does it make it pointless with the LSP by taking away any depth and warmth and just make it shiny?

Thanks

They are all LSPs in form. ZCS I always recommend to keep with the Z2/Z5 Pro sealants as they are designed to be compatible with each other. OS can be used as a standalone or either on top/below a carnauba (Top is my suggestion). Ultima Paint GUARD Plus is similar to OS as a stand alone. Ultima/Zaino are probably very good on durability (6 months if done right), but it's purely dependent on preparation. OS might lack, I've found it quite adequate and a step above previous sealants I've used. I don't see the issue of durability when you consider just how mind blowing easy it is to apply the WOWA application.

ZCS can be applied over Z Layers activated with ZFX (I believe). OS is better to wait 12 - 24 hours, but you can do it over a coat 1 hr apart. Ultima I'd wait the 12 hour time period. ZCS is the clear layer, it just seals in even more what it is beneath. OS/Ultima are independent and have their own looks.

Can't emphasize enough proper curing & preparation.

Put under carnuabas, the wax is slippery and sealants will have a tough time to bond, the Ultima and OS are spray sealants, i havent tried either, but i just ordered Opti seal like 5 min ago