What is the best product for blacking out wheel wells. Any tips on how to prep the surface or otherwise get the job done would be awesome to!

Rattle can would work, touch up yearly.

Blast and clean and have Line-x spray on. Never worry about in again.

Most were/are done with body undercoating - pro spray or rattle can - so that you get some rock/chip protection under there. Most dealers offered it as an option from them, even here in sunny SoCal.

Mine was "blacked-out" & undercoated black by the dealer, and I personally prefer the blacked-out wheel well look vs. the paint color wheel wells - especially with the bright look wheels of the Alloys, chromies, & even silver painted.

Wurth.

If there is shiney paint, you may need to rough it up with sand paper first or it will peel again.

I've been using Wurth undercoating spray for a couple years on both street and race cars and am very happy with the results. Prep is minimal, goes on easy.

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If you shop it hard you can get it down to under 9 bucks a can. I think the last case I bought was about 6.75 a can, but I know the Wurth rep.

Line-x is really good but it takes a lot of prep. I line-x'ed the entire inside and underside of my Lotus and very please with how it turned out.

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I really like europas. I tried to look at the link but it didn't open.

Looks like Wurth is in the lead.

I have fixed my link in my signature. It should open now.