I am very interested in this combination, because I have TurtleWax Platinum paste and Meguiars NXT paste (unused yet).
But I want to know whether the combo
Meguiars NXT + TurtleWax Platinum
is really better than
Meguiars NXT,
TurtleWax Platinum,
Meguiars NXT + Meguiars NXT,
or
TurtleWax Platinum + TurtleWax Platinum.
I do not want to test the combo in the near future, becuase my next waxing should last through winter. If I do something unproven (unpredictable result by unintended mixing of different chemical) and get poor protection, I will hardly have opportunity to correct it in cold harsh winter.
TurtleWax is a layarable cleaner wax. Below is from TurtleWax web (Get Waxed Tour,
http://www.turtlewaxtour.com/).
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Mild polishing agents safely remove stubborn road film. The carefully balanced formulation permits the option of multiple coats without deleterious buildup or removal of the previous coating. This allows customers to build the optimal finish for ultra protection for their distinctive vehicle. However, Platinum Series Paste Wax is designed to provide ample protection and shine with a single coat.
==========
TurtleWax also claims "This 21st Century, polyurethane-enriched silicone formula contains no wax and cleans/protects in one easy operation. New and Improved Finish 2001Œ can withstand the rigors of 52 car washes‹the proof is in the beading. "
RadMon,
NXT might be pretty strong against some chemical. I applied it on stainless steel pot. It was not removed by Ajax Antibacterial Orange dish wash detergent. I was impressed. It was removed by all purpose cleaner (Meguiars Extra) though. But note that paint surface is very different from stainless surface.
In a UK test, TurteWax Platinum did better than NXT:
http://www.autoexpress.co.uk/product_test/55103/car_polishes_and_waxes.html