And if you want to delve into the details, beading ability really only shows how much hydrophobic chemicals are left on the paint, not how much actual protection is left. So just because an old wax treatment still beads water well doesn't always mean that it is still well protected.
Some manufacturers have even started to complain about how beading ability is being over-used in comparisons between products simply because it is so easy to visually evaluate. This has led to some wax/protectant manufacturers adding more long-lasting hydrophobic components and less active protection components (to reduce the cost of ingredients).
2017 MY18 Golf R 7.5 Wolfsburg wagon (boring white) delivered 21 Sep 2017, 2008 Octavia vRS wagon 2.0 TFSI 6M (bright yellow), 2006 T5 Transporter van 2.5 TDI 6M (gone but not forgotten).
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