Rear Qtr Track Acne

[kasbridge]

All,
I think we must all have this problem, stones thrown up from the track causing small pimples on the rear quarters due to the lack of underseal.

I have got off relatively lightly thus far with only a couple on each side but they have caused small star cracks in the paint which is b****y annoying as the paint is original - cracks can't really be seen unless you are an avid polisher []

Anyone come up with an elegant solution to this problem? Dont really fancy caking the inside rear qtrs with gooey underseal unless I really have to and anything stuck onto the underside is just going to hold water/cause rot etc.

Thanks,
kevin

 

[Jamie Summers]

Kevin,
I have exactly the same problem, but about half a dozen pimples on each side. I took the car along to a dent repair place who confirmed it would be easy enough to tap the dents flat again, though I'm not sure what to do about the cracked paint. It seems ridiculous to paint a whole panel just for that, so I would be tempted to have a go with one of the DIY chip repair kits and just try to touch-in the cracks. I have used this sort of thing on the front end with quite acceptable results.
I've deferred doing anything about it until such point as I decide that I no longer wish to track the car or want to sell it ..........
There's not really anything obvious to do to stop it happening again, I'm pretty sure the arch liners from a regular C2 just won't fit with the RS suspension geometry. It's possible you could bodge something up using those, but I suspect it would be less than ideal.

Jamie

 

[Neil Haughey]

Something I intend to do this year on my race car is cover all the seams and edges back there with helicopter tape, not the 3M leading edge stuff as I have been advised it ages quickly and goes yellow but apparently you can buy the ventureshield stuff in rolls a couple of inches wide.

 

[kasbridge]

Jamie,
Thanks for the input, I did half fancy trying the C2 liners but I am not sure that they actually have any! Certainly Steve Brookes and John Lile's cars are the same as mine in that area - the difference of course is a nice thick layer of plasticised OE underbody sealant on the C2.

That's possibly a route I could look at - the likes of 9M could probably do a very OE job of applying the sealant but the extra weight of the sealant + my working foglamps and map lights could blunt the performance of the old gal []

Cheers,
kevin

 

[Steve Brookes]

ORIGINAL: Jamie Summers

There's not really anything obvious to do to stop it happening again, I'm pretty sure the arch liners from a regular C2 just won't fit with the RS suspension geometry. It's possible you could bodge something up using those, but I suspect it would be less than ideal.

We don't have rear arch liners on the C2 either which I think is because of the cat and final silencer arrangement on the 964. The factory underseal on our standard cars probably stops the 'pimpling' effect you boys get.

 

[Jamie Summers]

I just assumed the C2 had liners as I've never seen one with the pimples ! Come to think of it I don't remember ever seeing them on my old C2. Underseal is probably the (slightly undesirable) answer .........

 

[Damen]

Hi Kevin

My RS and Cup have been heavily wax oyled which provides adequate protection. I've gone a stage further with the RS and fitted 993 liners in the rear arches (964s don't have them). The 993 ones need shaping to fit but with a bit of effort do, and certainly provide the protection you'll need.

Damen

 

[PhilRS]

I did fit the 993 liners as well, years ago.

ORIGINAL: Damen

Hi Kevin

My RS and Cup have been heavily wax oyled which provides adequate protection. I've gone a stage further with the RS and fitted 993 liners in the rear arches (964s don't have them). The 993 ones need shaping to fit but with a bit of effort do, and certainly provide the protection you'll need.

Damen

 

[Barty964rst]

I also had a pimple / paint split and had the rear quarter re sprayed by Tony at GTR. he mentioned at the time he was going to manufacture carbon inner 'flaps' to prevent the stones being shot up into the rear quarter. I will ask him if any progress has been made on these units.

 

[Melv]

Same prob here. Resprayed a coupla winters ago...I'm sure my old 964C4 had rear arch liners....

 

[Hacki]

ORIGINAL: Melv

Same prob here.

+1

I leave it as it is. When ever I´ll stop using it, I´ll be able to have it fixed easily. To me that´s part of a Cup / RS / N-GT. And normally it´s not that bad, although visible.

An alternative could be the so called (over here) "Smart Repair", which is a good compromise as long as it is well done. They fix only the damged spot (dent and paint) and do not respray the full panel.

 

[h_____]

ORIGINAL: Hacki

ORIGINAL: Melv

Same prob here.

+1

I leave it as it is. When ever I´ll stop using it, I´ll be able to have it fixed easily. To me that´s part of a Cup / RS / N-GT. And normally it´s not that bad, although visible.

An alternative could be the so called (over here) "Smart Repair", which is a good compromise as long as it is well done. They fix only the damged spot (dent and paint) and do not respray the full panel.

What he said....either live with it (which I do), or take Damen's approach I would suggest for you.

I understand the issue Kevin, you have a really nice car, with good original paint, but you still like to use it properly. So what do you do? Keep it mint, or suffer a repair. What I would say is if you do get it repaired, take plenty of photos for history file.

My car has been repainted (at least once) so its no issue painting it again.

 

[kasbridge]

Thanks for all the advice fellas - some good options there - will chew it over....

Cheers,
kevin

 

[Dekker]

ORIGINAL: Melv

Same prob here. Resprayed a coupla winters ago...I'm sure my old 964C4 had rear arch liners....

The C4 has one wheel arch liner on the nearside only, more of a half liner as it fits mainly in the middle part of the wheel arch.

As for paint protection, this stuff is supposed to give a slightly rubbery stipple effect after a couple of coats.
Hycote Stoneguard Protection

"¢High build protective coating
"¢Resistant to salt, humidity and stonechips
"¢Stippled finish
"¢Overcoatable with Hycote colour match finishes

 

[oldtimer]

ORIGINAL: Dekker

The C4 has one wheel arch liner on the nearside only, more of a half liner as it fits mainly in the middle part of the wheel arch.

Yup , here's a picture of the 'half liner' in the lhs rear wheel arch of my 1990 964C2 , looks like what David is describing.
I found the 'pimples' on my 964RS were pretty much exclusively on this side , and this liner runs back to cover the area above the cat ( actual length not visible in pic). So could be a solution.

On the RHS of the 964C2 is just underseal , no liner.

 

[Dekker]

ORIGINAL: Damen

Hi Kevin

My RS and Cup have been heavily wax oyled which provides adequate protection. I've gone a stage further with the RS and fitted 993 liners in the rear arches (964s don't have them). The 993 ones need shaping to fit but with a bit of effort do, and certainly provide the protection you'll need.

Damen

Hi Damen,

apart from shaping the 993 arches to fit your RS did you have to weld any supports in place to hold them?

Also do you have a silencer in the Rt wheel arch like the C4/C2. If so is that what the shaping was all about?

David