Well then you could always pass it off as a Road worn right??
The only kind i use is a spray(for guitars), but I always wondered about using car wax as well.....I can tell you on MY Highway one, i bought it and noticed some pick scrapes on the body(quite ugly) and I used a cheap 2 dollar polishing compound(the paste type) and it worked great, with 0 scratching/etching marks( f o l l o w directions on the can)
to answer OP I think it wouldnt hurt it, however, guitar spay is about as much (cost wise)and less messy, so i use spray...

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I can't find the Crossroads, my GPS must be broke....


2001 Fender Highway One, 2004 Fender SE Ash, 2011 Fender 200 SCE '99 Washburn WR120Pro, Amps: Fender Stage 160, Vox Valvetronix 30, Peavey 212 400 watt, Ibanez 50 watt Toneblaster

Carnuba paste wax was first developed and used on wood finishes.

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"Life is like eating jalapenos. What you do today may burn your arse tomorrow"

Since the Fender Care Kit was made by Meguiars (who made their name with car care products) I'd say there's no problem using carnuba on a Highway 1. Every rumor I've ever seen on the subject says it was the same stuff.

I have the Fender Care Kit and it works well. I haven't noticed any adverse effects. It is what I use on all my guitars.