Undercoating Painted Flares?

[Flygti]

My Jeep is in the process of being fully repainted. I'm thinking of undercoating the inside of the painted flares so rocks don't spider the fresh paint. Has anyone done this before? Any recommendations on which undercoating to use?

Some pics of the current state of my Jeep.

 

[GASnBRASS]

Paint looks really nice! hopefully it'll be a summer only toy, since salt destroys everything it contacts. As for coating inside the fenders, don't use that rubberized spray coating. They don't seal that well and just trap moisture and salt between the coating and the metal. If you look at most cars they use plastic wheel well liners to protect the insides of the fenders. While our rear wheel wells have a plastic liner the fronts are totally exposed. I'd be more inclined to have the wheel wells of the front fenders professionally coated in a durable thick bedliner such as rhinolining or line-x that won't crack or peal like cheap undercoating would. Other option would be to paint several coats of implement paint or a hard chassis paint and let it cure fully before driving it, and then spraying fluid film over it periodically.

 

[Flygti]

The paint has turned out really nice so far. Makes me not want to drive it in the winter, but unfortunately I will be.
I'm going to be Stone-Guarding (PPF) the majority of the painted surfaces. My main concern right now is undercoating the plastic flares. The rest of the undercarriage I'll probably to something like Fluid Film, Cosmoline, etc. I agree that the rubberized undercoatings aren't that good. I'm sort of leaning towards Line-X for the underside of the flares.

 

[GASnBRASS]

Oh you're talking about just the plastic flares themselves? I wouldn't bother to put anything on the inside of them, they are just plastic and no one will be peeking inside your flares (unless you're into concours shows).

 

[Flygti]

Yup, just the underside of the flares. The reason why I wanted to do this is because when larger rocks hit the inside of the fender flare they can and will cause the painted surface to spider at the area of impact. Normally I wouldn't care but with the new paint turning out as good as did I want to keep it looking good as long as I can. This new paint job has my OCD working overtime . The rabbit hole is getting deeper and deeper.