303. 303. 303. That is all you need to know and use.
I use it on my Kubota, RV, ATV'S, side by sides, truck bed liners, bed covers, mirrors, door handles, Jeep soft and hard tops, etc, etc, etc, and ANYTHING plastic, fiberglass, or vinyl. Been using it for years. A++++
It is truly top notch. But, you might be too late. Don't expect your faded plastic fenders to look new. But if you'd used 303 from the beginning... They would be closer to new. Use it now to STOP the fade and protect it's integrity or strength.
Hands down, it's 303. There is nothing as good.
I searched for years, decades. 303 is it.
And no, I don't work or get paid by 303.
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I could show you pics of my 12 and 20 year old Honda ATVs... 303 treated yearly. Plastics are darn near like new.