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Antique Tractor Paint and Bodywork

Pitted Sheet Metal

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grantaidan

01-14-2005 09:26:10




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I am planning to paint a IH Cub. The gas tank has some slight "pitting" of the metal. I thought I saw a posting some time ago that mentioned a way to spray and sand until the surface is smooth. Is there a special primer that needs to be used, or can I use normal primer and sand until smooth?

Thanks

Mike




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fiberglass

01-17-2005 17:50:04




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 Re: Pitted Sheet Metal in reply to grantaidan, 01-14-2005 09:26:10  
There are only two products that I would suggest using. a epoxy primer and a two stage spot putty. They are both readily available at any auto body supply store. Two stage putty sands very easily and will not shrink. nor will the epoxy primer. dont go with the best price!!!!! Hi, fill primers tend to shrink and show up as a poor quality job a few weeks or so after you paint your project, also stay away from lacquer based primers, as they also shrink even if sprayed with a sealer prior to paint.

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dr.sportster

01-15-2005 06:43:26




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 Re: Pitted Sheet Metal in reply to grantaidan, 01-14-2005 09:26:10  
There are heavy primers like Fill and sand or Kondar but they wont be enough for what you describe.Nitrostan is the filler used on the pinholes and such but as mentioned its not for bare metal.you might have to skim coat entirely in plastic filler.My product knowledge is somewhat outdated but I have worked on these type surfaces and had to coat and sand so to speak.Just use a quality filler.



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TDK

01-14-2005 19:39:03




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 Re: Pitted Sheet Metal in reply to grantaidan, 01-14-2005 09:26:10  
I used "Ultra-Fill"(Sherwin-Williams,I think) primer a few years ago for filling pits. Was not impressed. The two part putty is better. Paint supplier should be able to tell you if it can be used over bare metal or epoxy.



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grantaidan

01-14-2005 09:33:42




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 Re: Pitted Sheet Metal in reply to grantaidan, 01-14-2005 09:26:10  
I did not think bondo was for pitting. I thought it was for fixing only dented metal. Can it be used to close the pitted metal?



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pat s

01-14-2005 14:56:11




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 Re: Pitted Sheet Metal in reply to grantaidan, 01-14-2005 09:33:42  
Bondo makes a single element compound in a tube. It thinner than body putty, spread with a plastic spatula. It is designed to fill small scratches & pits



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CNKS

01-14-2005 17:59:13




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 Re: Pitted Sheet Metal in reply to pat s, 01-14-2005 14:56:11  
I believe that is a thick primer type stuff, not sure it is suitable for bare metal, more for filling pinholes in the bondo, which is what I use it for. Personally I would be afraid to use it over bare metal, or even over epoxy primer. Others may disagree, which is ok.



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CNKS

01-14-2005 13:31:49




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 Re: Pitted Sheet Metal in reply to grantaidan, 01-14-2005 09:33:42  
I have used bondo to fill pits. The only problem is if you have to spread the stuff over the whole tank, you have a LOT of sanding to do. I usually use it on small areas. There are also some putties available that are somewhat easier to sand, but they are two part also, meaning they get very hard. The names of the sprayable "fillers" escape me now. I'm sure someone else will answer. If the pits are very deep they would be hard to fill with normal surfacer, would require many applications and a lot of sanding also.

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t.grim

01-17-2005 14:45:33




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 Re: Pitted Sheet Metal in reply to CNKS, 01-14-2005 13:31:49  
a product called icing is what i would use.It can be used over bare metal or primed surfaces. it is very thin bondo - use it that way. should be available at any auto paint place. 220 grit on the d/a, prime /wet sand with 600, clean up and ready for paint.



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