997.2 Rust on inner arches

[alex.holbrow]

Hi, recently purchased my first Porsche after a string of M cars. With it being an older car i was concerned about corrosion so looked up potential weak spots. After a bit of research I saw that a few people had mentioned removing the rear arch liners as crud can accumulate there.

Removed the rear wheels and arch liners this weekend to find indeed, a large amount of sandy mud! Along with some small bubbles in the U shaped lip in the upper part of the arch where moisture has been allowed to sit.

After removing and cleaning up the dirt I found that it had unfortunately taken hold in some smallish areas but I believe its solid enough not to need any major work.

I've wire brushed the affected areas and treated with Kurust but unsure what to use to protect with before i refit the liners. My local car bits shop thought that silver Hammerite would be fine but then i've read that other owners think it'll crack and peel off.

There is also an area extending about 8cm from the rear jacking point along the sill seam that i'd intend to treat in the same way.

Any recommendations or if anyone has done the same job and has any advice it would be greatly appreciated.

I have tried to upload some images but it says the file sizes are too large.

 

[dee.chury]

You can try Bilt Hamber products which work well. Try Deox Gel to spot treat and neutralise the rust, then clean the general area with Atom-Mac. Finally protect the area with Dynax UC.

 

[alex.holbrow]

Thats great. Thank you for the recommendations.

 

[911hillclimber]

Just my experience, not much different to above.

The Bilt solution I feel is a modern Kurust and is better.
I used Bilt on my recent rust spots on my 2009 Boxster.

I then used smooth Hammerite in places or Porsche repair paint that is quite thick and colour dense where the repairs may be seen.

I have used smooth Hammerite for decades for these jobs, and for major restoration of classic cars and classic motorcycles, just follow the instructions on the tin especially application temperatures.

After all that a good coating of a spray-on inhibitor like Waxoyl if the area is hidden will add to the barrier, esp behind arch covers.

Have you checked the leading edge of the sills? The front tyres grit blast the front surfaces to the bare metal if left too long.

I think you are investing good time and effort for the future!

 

[alex.holbrow]

Thats it, exactly as you say 911hillclimber, i'm trying to invest a bit of time and effort to protect and help preserve for as long as poosible!

The sills behind the front arches seem fine and behind the front arch liners is spotless due to the liner fitting the whole of the arch. The sills around the jacking points need a bit of attention though.

Great cars but not immune to the dreaded tin worm.

I'll attach some photos when I get around to doing the sills.