this post was submitted on 07 Jul 2026
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Invest in some fluid film or other lanolin based undercoating, that way you can stop the road salt damage from getting any worse.
I did already get myself some Surface Shield which is exactly that kind of lanolin based protectant, after also reading about some of the more hardcore stuff like POR-15 that I'd worry could trap water or hide damage.
I've used it a bit on my car near where I have some wheels removed to work on the brakes, and tried it on some garden tools.
Impressions are very good and I totally plan to cover the underside of my car with this stuff when finishing up work on it. Just not the exhaust I imagine.
Surface shield is just as good or better. You know your stuff, good for you! I do at least one application before winter, and on my car with a little rust I do once more in the late spring as well. The stuff doesn't seem to harm rubber, so I go crazy and spray it all over with my little 5 gal air compressor and a woolwax gun. Beware, it makes future underside work much dirtier, but I much prefer that to battling rusty bolts.