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The guys at the shop suggested a good grinding and sanding since the rust was surface. Then an epoxy sealer before the Stonegard. In addition none of us were happy with the Stonegard color match to original so we will finish with a paint coat. No one bad mouthed POR 15 but I think they have epoxies you and I cannot get to.

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Originally Posted by zztot View Post
Guys: Have heard many of you mention POr15. I have heard and in one case experienced top coat not bonding well to por15. Consulted Porsche resto specialist and he suggested alternate finish for rust prevention without negative comment on 15 although my question was directed specifically at P15. What has been y'alls ( thats SC talk) experience and/or knowledge .
Thanks
TOT
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Scott
'86 911 Carrera Coupe, PCA, PBC
Old 01-10-2009, 07:40 AM
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I have my tank 90% stripped and will finish it this weekend. My question is that all I can find online in an aerosol is the Wurth Stoneguard in black. I see it mentioned in places as being available in gray but I cant find it. Does this mean I need to use the black then paint it with a gray? I'm concerned about painting over the rubberized and having it stick for long? Thanks, Mark
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1997 C4S stock...ish
1970 911T Restored Hot Rod....Sold
http://forums.pelicanparts.com/porsche-911-technical-forum/418411-here-my-new-old-project-lilly.html
Old 01-12-2009, 08:51 AM
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I was referred to this guy, http://www.goodspeedmotoring.com/. He had the grey and was very helpful. The grey is close to original but not spot on. So if you are doing concours you will need to paint it. If not the grey is close enough. The guys I am working with will color match the original and paint over the grey. They do not see a problem. I like using the grey so that if and when the paint scratches I will have grey exposed, not black.

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Originally Posted by Carrerax View Post
I have my tank 90% stripped and will finish it this weekend. My question is that all I can find online in an aerosol is the Wurth Stoneguard in black. I see it mentioned in places as being available in gray but I cant find it. Does this mean I need to use the black then paint it with a gray? I'm concerned about painting over the rubberized and having it stick for long? Thanks, Mark
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'86 911 Carrera Coupe, PCA, PBC
Old 01-12-2009, 09:01 AM
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Thanks! I will order some. My tank was slightly different colors on the top and bottom. I will just do it all in the gray. I'm thinking 2 cans should do it.
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1997 C4S stock...ish
1970 911T Restored Hot Rod....Sold
http://forums.pelicanparts.com/porsche-911-technical-forum/418411-here-my-new-old-project-lilly.html
Old 01-12-2009, 10:05 AM
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Project Update:
What started as a simple freshening turned into something more, big surprise! After stripping the bottom, grinding the mounting flange, and feathering in some damage on the top we went on to finish. The bare metal was shot with epoxy primer and Wurth Stonegard grey was applied over that. For most people that could be the end. However I found the Stonegard a bit blue compared to original so we shot a color coat to make the grey color a bit browner. I love the finished product.




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'86 911 Carrera Coupe, PCA, PBC
Old 01-19-2009, 09:23 AM
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Looks great! Can I ask what color gray you found that was correct?
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1997 C4S stock...ish
1970 911T Restored Hot Rod....Sold
http://forums.pelicanparts.com/porsche-911-technical-forum/418411-here-my-new-old-project-lilly.html
Old 01-19-2009, 09:47 AM
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The paint was mixed in the shop by their paint guy. I suggest you visit a quality shop and they can mix something for you. Or check out Color-Plus (http://www.colorplus.com/). They have a "gas tank grey" paint that was formulated for the Porsche tank.
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'86 911 Carrera Coupe, PCA, PBC
Old 01-19-2009, 10:07 AM
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Quote:
Originally Posted by deshetlr View Post
Project Update:
What started as a simple freshening turned into something more, big surprise! After stripping the bottom, grinding the mounting flange, and feathering in some damage on the top we went on to finish. The bare metal was shot with epoxy primer and Wurth Stonegard grey was applied over that. For most people that could be the end. However I found the Stonegard a bit blue compared to original so we shot a color coat to make the grey color a bit browner. I love the finished product.




Scott, great write-up and project. Thank you. My 86 tank is almost identical to yours, rust at the seams and some flaking coating on the bottom.
I'm right now in the process of scraping off the top end of the tank and now I am glad I didn't just do some touch-ups. Underneath an immaculate original stone guard I found a few areas with surface rust spots. Next step will be to have the tank epoxied.

Last edited by Garp; 01-20-2009 at 02:31 AM..
Old 01-20-2009, 01:06 AM
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I have had great success using Norton and 3M Clean and Strip Disks for removal of Schutz without removing metal. Works fast and no chemicals. Still will need to media blast the cracks and crevices, but makes very fast work of the stone guard. About $10 bucks a dick, but big labor saver.
Old 02-25-2010, 06:58 PM
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Please keep in mind this is only my opinion. But POR 15 is not the magic stuff that seals rust dead. It's just a special paint. It's a bandaid if you can't do any better. If a person can wirebrush, sand, mediablast or aciddip the rust away...do it. Por 15 is something to use when nothing else will work to save a rusted piece or if you can't afford to replace metal or do it the right way. I have seen that stuff peel off in sheets after being on a car for a couple of years. IIRC their spec sheet details how apply the stuff to bare metal. People use it as a substitute for undercoating not realizing that it does not stick to bare metal very well.

Just my humble opinion.
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Old 02-25-2010, 11:22 PM
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BTW those finished tanks look awesome!!
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Old 02-25-2010, 11:24 PM
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I am just beginning to do a tank clean up/battery tray fix and found this thread through a search. I wanted to resurrect it to ask the contributors if they were happy with the final out comes of their tanks after 3 years.
As I start to pick away at the edge of my tank, I can see that there are spots that have rust under the original coating even where there are no abrasions. I am assuming that I need to strip the whole thing, epoxy coat (not POR 15) and use Wurth to get the factory look.
Has anyone tried caulking with a matched color over it instead of Wurth?
As this thread now several years old, any comments from Scott or anyone else?
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1977 911S

Last edited by racer_X; 01-15-2012 at 12:33 PM..
Old 01-15-2012, 12:22 PM
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Mine has held up beautifully. I highly recommend completely stripping the tank and mechanically removing the rust. The Wurth product replicates the original the best but I am told 3M makes a nice product as well.
Old 01-15-2012, 02:07 PM
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Thanks for the reply Scott. Is this what you used?
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1977 911S
Old 01-15-2012, 03:26 PM
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I used the gray stonegard. It is close to the original color. However I am an originality nut so my body shop got even closer by shooting a color matched gray over it.
Old 01-15-2012, 04:44 PM
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I just got around to stripping my tank, the inside looks new! I am so happy!




I am about to order the Wurth Stoneguard SKS grey in spray cans, anyone know how many cans you will need to cover the outside of the tank?
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Old 02-27-2012, 01:57 PM
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Used por 15 on my tank without topcoating,holding up well.Mysuspension was por15 painted,followed by por topcoat.Initial results were mixed,with poor adherence,or else the topcoat would turn to pancake syrup while brushing.Bit of alearning curve involving lots of sanding.Used their gas tank restore kit,with nice results.
Old 02-28-2012, 04:25 AM
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I was going to keep the inside of the gas tank as is, it is spotless. However, I am still not sure how to finish the outside, as another thread said that the spray cans of Wurth Stoneguard SKS do not give you the same OEM texture

Can anyone confirm this?
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1977 911S
Old 02-28-2012, 06:43 AM
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Never used the cans but the OEM finish comes from using a schutz gun. Wurth sell one that screws directly onto their 1ltr bottles (excuse the metric measurement!).

If you're planning on doing other work with SKS then it might be worth getting one (assuming you have a compressor). Otherwise you might be able to borrow one from a friendly local Pelican.
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Old 02-28-2012, 03:00 PM
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This is the tank using the Wurth Gun and Grey SKS
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1983 Porsche 911SC Zinc Metallic - 3.2SS PMO's, Rennshift, 22/28 TB's, partially backdated interior. 28 month restoration now complete
2010 BMW 135i - Love it.
www.project911sc.wordpress.com
Old 02-28-2012, 03:04 PM
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