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    #16
    Originally posted by mflueras View Post
    ok so what is the best spray on diy spray on undercoating preferred by everyone?
    Welcome!

    The one I use is Rust Check. They have a reddish liquid Rust Inhibitor in a red can that is great for places where you want oil to flow into, like bottom door seams and trunk seams, though it tends to drip or seep out (which doesn't bother me). For the exterior, I mostly use their thick Coat and Protect in a green can. I get the Rust Check when it goes on sale at Canadian Tire. They usually have it on sale several times a year, so I just keep checking their flyer before I need it.

    I would much rather throw a bunch of cardboard on the ground and crawl under my car and do it myself than take it to a shop where they won’t necessarily get into all the nooks and crannies. I also don’t like the idea of drilling holes. You should be able to get to everything using existing holes.

    Two particular trouble spots are: 1. front fenders at the wheel well lip, and 2. particular corners of the frame near the cats. For the front fenders, you can take out the fender liner bolts near the top of the wheel well and use those holes to spray both types of Rust Check (the liquid to flow into the lip seam and the thick stuff for good measure).

    One of the frame corners appears in the following photo from this thread: http://www.grandmarq.net/vb/showthre...tier-New-Ride-). The other side of the frame has the same problem.

    Originally posted by piranah View Post
    ... I found some underside photos. ...[ATTACH=CONFIG]40940[/ATTACH] ...
    I saw another photo recently (possibly on Crownvic.net) where those corners were literally rotted off. When I did mine (after discovering significant holes), I saw a way to spray something into those corners using the existing holes in the frame in that area. For the inside of the corner, you could again use the liquid stuff so it flows to the bottom and coats it good and then use the thick stuff for good measure.

    There is another product (I'm not sure if it's exclusive to Rust Check) that is a “rust converter”. It's supposed to transform rust into something else, but I’ve never tried it. I saw someone else mention it on this site recently, and I’ll be asking about it when I find the post again.

    Let us know how things go with whatever you end up trying.

    2000 Grand Marquis LS HPP, a hand-me-down in 2008 with 128,000 km; 175,000 km as of July 2014
    mods: air filter box 'tuba', headlight relay harness, J-mod (around 186,350 km), 70mm throttle body, KYB Gas-A-Just shocks, aluminum driveshaft, ARA3 PCM

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      #17
      Welcome!
      I too am new but was a long time troller. I prefer the pushrod years as I'm weirded out by those oil burning dual camshaft motors lol.

      As for rust prevention I second an oil base treatment. I take all my vehicles that see salt to get Krowned. Canadian thing but it works. Stay away from coatings. Why? Coatings will trap moisture which will of course rot your car out.

      Derek.
      1985 LTD Crown Victoria - SOLD
      1988 Town Car Signature - Current Party Barge

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