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If "more protection" means "longest sustained protection" to you, then hands down that would be Collinite 845. Haven't seen anyone counter this claim. Slickness is always a characteristic that wears off before the protection, so folks wind up topping with additional wax (spray waxes get downright popular here) at their leisure or moving to other waxes as they accept tradeoffs since durability and slickness are at opposite ends of the scale.
In my experience, I've found several products that last longer than 845, including its two Collinite brothers, 476 and 915, as well as SNH, Bilt Hamber Finis Wax, the Klasse twins...
Great waxes no doubt. He asked for "last longer" and "slickness", so that's why 845 edged up higher on my list.
In general, synthetic waxes can and often last longer but to date I have seen no diffentive proof that one protects better than another. Since UV protection is added to both products and the layer is so limited, its hard to imagine just how much long term protection either can offer. So as Mike often offers, "find what you like, and use it often".
I agree that Im very skeptical of durability claims. On that detailingworld site guys are always talking about 4-6 months of protection from some higher end carnuba waxes, which I think must be a joke. Those cars are either sitting in a garage all day, or are being topped off with rather durable products following each wash.
But I will say this, I apply FK1000p over thanksgiving weekend, and only wash my car once a month over winter, topping with GG spray wax ( not a durable product ). Its still beading tightly in April when I start using 'beauty' waxes. Ive never gotten that length of durability with other sealants or waxes.
A lot of it really depends on the climate. Over here in Manila, with our tropical climate, heat, humidity, incessant rain and industrial fallout all conspire to severely impact the longevity of any LSP - sealants like BFWD and WGDGPS are dying after four weeks, 845 after six - few products are able to reach two months while still performing well. Doesn't mean I doubt it when people talk about 845 lasting three, four months - just means their climate is more conducive to the product's longevity than it is over here.
Francis