Collinite 476s should be one of the strongest if not the most.
Couldn't watch for how long the beading lasts but the shine I got from
Carlack NSC + LLS (Similar products to Klasse AIO + SG) sealant twins
did last a good 6-7 months maybe longer. I could have applied LLS a
second layer a day after the first but I just can't find the time to
rewash and seal the car.
A good pre-cleaning does pay as far as I know, as in the case of
Carlack's twins. For instance, ValetPro from UK rates its wax/seal
product Artemis between 3-6 months. 3 months if used after a mild
cleaning with their multi purpose paint cleaner/wax/qd product Citrus
Bling, but a good 6 months after a proper polish with Achilles Prep,
again their specialised paint cleaner/polish.
Carlack Nano Systematic Care AIO is said to be a great paint cleaner
to be topped with an LSP. Carlack NSC + Collinite 476s is a highly
regarded durability king AFAIK.
Seckin