Re: Oil undercoating? (materials used ?) - Saab 900 Bulletin Board - Saabnet.com
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Re: Oil undercoating? (materials used ?)
Posted by compaqted (more from compaqted) on Mon, 22 Apr 2002 11:23:00
In Reply to: Oil undercoating? (materials used ?), Brice A, Mon, 22 Apr 2002 10:25:54
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The C900 has a fiberglass undercoating that is pretty heavy duty already. Note that if you are applying new undercoating to the underbody and that underbody has any moisture on it at all, you will be trapping it and ultimately, you might get more rust than you intended to prevent.
You can get cans of spray undercoating at any autoparts store. Try the 'rubberized' kind as it flexes somewhat. You can also get gallons of it in paint cans that you can brush on, but this is extremely messy (it is essentially roof tar).
If you are repairing a rust spot, wire brush it down to the metal, then apply a 'rust-eater' acidic solution to it. This converts leftover rust, and ultimately turns black. Then you can put on a 'galvanized' paint primer, then put the undercoating over that. IOW, if you don't get every speck of rust, it will come back.
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