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THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHUnderbody wax - worth it or dealer BS? - Page 1 - Boxster/Cayman - PistonHeads UK
Leading reported evidence
Clean underside
Suggestion or failed attempt
No successful repair reported for this finding.
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0
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1
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Suggestion
There are water based products that can be applied to a relatively clean underside with temporary anti-corrosion and protective benefits.
Underbody wax - worth it or dealer BS? - Page 1 - Boxster/Cayman - PistonHeads UK
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Leading evidence: 'Clean underside' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Clean underside' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.
Source reports, not a diagnosis or a success probability. Counts refer to discussions and can overlap.
Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
Discussions that contain suggestions
1
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Suggestion · Original poster
I have never had this done to any car I’ve owned despite running year round throughout the winter and haven’t had issues, but I usually run modern cars rather than classics which are presumably already treated from the factory.
Underbody wax - worth it or dealer BS? - Page 1 - Boxster/Cayman - PistonHeads UK
Run year round throughout the winter and haven’t had issues
Suggestion or failed attempt
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
Discussions that contain suggestions
1
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Suggestion · Original poster
I have never had this done to any car I’ve owned despite running year round throughout the winter and haven’t had issues, but I usually run modern cars rather than classics which are presumably already treated from the factory.
Underbody wax - worth it or dealer BS? - Page 1 - Boxster/Cayman - PistonHeads UK
Run modern cars rather than classics
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Discussions that contain suggestions
1
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Suggestion · Original poster
I have never had this done to any car I’ve owned despite running year round throughout the winter and haven’t had issues, but I usually run modern cars rather than classics which are presumably already treated from the factory.
Underbody wax - worth it or dealer BS? - Page 1 - Boxster/Cayman - PistonHeads UK
Run year round throughout the winter and haven’t had issues
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Discussions that contain suggestions
1
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Suggestion · Original poster
I have never had this done to any car I’ve owned despite running year round throughout the winter and haven’t had issues, but I usually run modern cars rather than classics which are presumably already treated from the factory.
Underbody wax - worth it or dealer BS? - Page 1 - Boxster/Cayman - PistonHeads UK
Coverage and how to read this overview
Counts describe captured discussions, not unique people or a diagnosis. Author identities are not reliably stored. Exact duplicate evidence is counted once across matching discussions; one discussion counts at most once per action/state. Multiple repairs reported together remain a combination. Suggestions and failed attempts do not establish a fix. Matches cover whole discussions and can include related faults, model variants and incomplete threads.
6 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
PistonHeads: 1 discussions
0 evidence records excluded for query context · 0 excluded by outcome qualification · 0 adjusted by outcome qualification.
0 acknowledgements have no verified action link; they do not establish a repair result.
Generation: 20261026T174436Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
Was offered one of these the time the car was in at the OPC. I have never had this done to any car I’ve owned despite running year round throughout the winter and haven’t had issues, but I usually run modern cars rather than classics which are presumably already treated from the factory. Car usually resides in a dehumidified garage and the underside looks pretty good to me with no visible corrosion at 7 years old despite 60k+ miles.
Any views, worth it as the car ages or unnecessary BS?
There’s no such thing as ‘one of these’. It’s an expensive and specialist job to do it properly with dinitrol and you need to find someone who knows how to do it. It’s all the brackets, fasteners and clips that corrode first and while not structural can become a mess. Next thing is seams on sills etc. I’d definitely do it unless (like me) you don’t use it in wet or at all in winter.
The Cayman has a hot-galvanized all-steel body. Add on rustproofing is generally a bad idea since it tends to trap moisture and dirt. And with a galvanized frame, it's pretty much pointless. Ymmv, other views no doubt available of course.
I didn’t know that this sort of thing was still available - takes me back to the seventies on my back under neath ford capris applying it by hand ! I would say a waste of money on a Porsche with their fully galvanised bodies and all the under body plastic panels these days.
Depends on the product.
There are water based products that can be applied to a relatively clean underside with temporary anti-corrosion and protective benefits.
Quite useful if the car is then going to be stored perhaps over winter.
But this would wash off quickly in normal use.
Dinitrol, and similar, are specialist products that require careful preparation, and provide long term protection to surfaces and cavities - most useful on older and classic cars.
Such treatments can take 2-3 days to correctly apply and cost four-figure sums.
