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Any thoughts on rust undercoating, whether from dealer or not? I saw a demo in person, it looks goopy and clumpy, thought it may potentially ruin the aesthetics of the underbody and also the resell value of the components like the exhaust. Live in a snow heavy area.
Motor vehicle Grille Wood Gas Automotive exterior
 

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08 STI / 85 CB650SC Nighthawk (kinda cafe)
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One of our shop cars came with a non-negotiable under coating. I spent 10 hours over two days stripping it all off. This and tire shine are my two least favorite things ever.

Just wash your damn car regularly.
 

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2017 Tacoma / 2013 GS350 / 1989 4runner (previously 1990 Celica GT4 / 1999 4runner)
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One of our shop cars came with a non-negotiable under coating. I spent 10 hours over two days stripping it all off. This and tire shine are my two least favorite things ever.

Just wash your damn car regularly.
Not good advice for anyone that lives in the north.
 

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Something old, I hope to be upgraded to something newer
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Yep, ACF-50 or one of these (if available in the US) for me: The BEST motorcycle rust inhibitors

I don't like that black undercoating because it can be a real pain if you ever need to undo any fasteners, if carelessly applied it can plug up drain holes, and I've heard tales of it partially peeling and trapping water and junk underneath it and making corrosion worse.
 

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For what its worth, my sw20 got dealership installed undercoating when new. Drove it year round, it rains for like 4 months straight here and I used to go to school on a mountain which had snow every week in the winter. It was also parked outside for the first 8 years of my ownership. Still rust free and mint. It is ugly though, especially after 33 years. It was originally cream coloured and it's now a good mix of dirty and stained.


On the flip side of things, the subframe here is just the factory underbody paint, no undercoat in that area. It too is okay so who knows if the car would have been also okay without undercoat.

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