To undercoat, or not?

[rastaman]

The bottom side of the tub, of my 88 Ser 3, is still in good condition, with surface rust (now cleaned, treated and painted) on the steel braces. Since I have already pressure washed the underside and have not yet driven it on the road I am wondering if I should spay under coating such as a 3m product, on the underside.
Since this LR is 38 years old, and the tub is still solid, is this advised or should I just leave it alone. I am in Florida so salt is not an issue.
Is there a recommended undercoating?

david,

[artpeck]

Personally I would leave it alone. I am in northern California and my frame is still rust free with no undercoating 38 years later. Undercoating makes every other repair in the vicinity difficult as it is a big gloppy mess and you have to worry about it trapping moisture against the metal. One man's view.

[Jim-ME]

If it is not exposed to salt, salt air, or the ocean I wonder if you need anything. I personally think that Waxoyl is a better undercoating product and plan to do my Rover because I live in Maine.
Jim

[SafeAirOne]

Might consider just spraying on some rust converter/primer. For non-harsh environments such as yours, that stuff does a pretty good job of stopping rust and leaves a hard shell on the part.

I personally prefer the stuff sold by The Rust Store (it's all I've ever used), but the one sold by Gempler's comes in a spray can.

[Billy5]

Mind if I jump in? I just got my first Rover. Series 2a. I am wondering the same. I live on Long Island, so I am right near salt water. THe frame and underside is perfect and I would like to keep it that way. So, whats the feeling about POR 15? I am a painter so I have plenty of spray guns. It also comes in Aerosol cans for those nooks and crannies. I do not want a thick gloppy mess. OR do I just wire brush clean and use regular paint, with keeping a steady eye out.

[JackIIA]

I just shipped an old scout (64) from AZ for my girlfriend. Tons of surface rust, but nothing real deep. Still it will be here in NE and on the Cape.

FYI, I looked into Waxoyl b/c of it's rep, but it was $800 for professional, thorough application. That's just too much given my budget. I've heard of some using old engine oil, though I wouldn't.

[yorker]

I've seen people use a lot of different stuff:

http://boeshield.com/

http://www.fluid-film.com/

http://www.rust.co.uk/dinitrol-products.cfm

http://www.virginia.edu/cese/research/CPC%20talk%20at%20AA2002.PDF

Dinitrol AV 15 & AV 30 now called ARDROX

LPS3 etc

Really though where you are I think I'd leave it alone, keep it clean, and just keep an eye on it, I've seen some cars from FL that have rusted due to the salt air and surf driving but compared to the rust belt you guys don't have much to worry about.

[lrdukdog]

underseal

If you don't you maybe sorry in a few years. If on the otherhand you are careful and rinse the inside of the frame. That includes outriggers as well. Do it on an incline you should be "ok".
Jim Wolf