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**HO455** · 01-25-2019, 02:44 PM

Any coating is only as good as the surface preparation. If you are going over existing crud or old coatings you take the chance of creating pockets or voids that only trap the wet salt water that will eventually dry leaving the salt for later moisture to reactivate.
In my opinion anything other than fresh paint or clean metal under a new coating is a worsing of the situation. I feel you will be better protected by cleaning and spot coating existing rust with a POR 15 type product, then washing the underside regularly to clean the salt away. I have heard good things about this product, but never used it personally.

https://ver-techlabs.com/fleet-washi...uck-corrosion/

01-25-2019, 02:44 PM	#5
HO455 Post Whore Join Date: Feb 2016 Location: Portland Oregon Posts: 10,883	Re: Undercoating or no undercoating? Any coating is only as good as the surface preparation. If you are going over existing crud or old coatings you take the chance of creating pockets or voids that only trap the wet salt water that will eventually dry leaving the salt for later moisture to reactivate. In my opinion anything other than fresh paint or clean metal under a new coating is a worsing of the situation. I feel you will be better protected by cleaning and spot coating existing rust with a POR 15 type product, then washing the underside regularly to clean the salt away. I have heard good things about this product, but never used it personally. https://ver-techlabs.com/fleet-washi...uck-corrosion/ __________________ Thanks to Bob and Jeanie and everyone else at Superior Performance for all their great help. RIP Bob Parks. 1967 Burban (the WMB),1988 S10 Blazer (the Stink10 II),1969 GTO (the Goat), 1970 Javelin, 1952 F2 Ford OHC six 4X4, 29 Model A, 72 Firebird (the DBP Bird). 85 Alfa Romeo If it breaks I didn't want it in the first place The WMB repair thread http://67-72chevytrucks.com/vboard/s...d.php?t=698377