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Sheet metal pitting!

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Andrew Z

03-25-2007 12:53:53

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I got a set of fenders for an H and they have some pretty deep pits, but overall they are in good shape have, they are soild and not paper thin. So my quesiotn what is the best way to fill in these pits, Is there a "heavy" sandable primer that I could use, bondo, not really sure what to do. I dont need them to look 100% but 75% would be nice.

Thanks for the help

Andrew

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Farmall Freak

03-26-2007 12:43:12

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Re: Sheet metal pitting! in reply to Andrew Z , 03-25-2007 12:53:53

I would use bondo to fill it in. We used bondo as a a filler to fill the gaps in the hood of my Cub. Right now you can't tell that there was even a piece cut out of the hood.

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CNKS

03-25-2007 16:26:51

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Re: Sheet metal pitting! in reply to Andrew Z , 03-25-2007 12:53:53

After cleaning, use bondo or a similar product. Do not sand too hard or you will dig it out of the pits. Follow with a non-sanding epoxy primer, which will give the following sandable surfacer or surfacer a good bite. Sand it smooth (400 grit) and topcoat. If not smooth, reapply the surfacer. Two suggestions are PPG Omni MP 170 for the epoxy, followed by PPG Omni MP 181 primer surfacer or MP 182 surfacer. The 182 is two part, the hardener contains isocyanates, requiring supplied air for breathing. The 181 does not use hardener. The 170 is two part but the hardener does not contain isocyanates. 170 has a 3 day window to coat with something else, otherwise it has to be scuffed and reapplied.

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georgeky

03-25-2007 13:11:48

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Re: Sheet metal pitting! in reply to Andrew Z , 03-25-2007 12:53:53

Andrew if the pitting isn't to deep the primer will work, but if very severe I would go with bondo.

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Wardner

03-25-2007 13:10:25

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Re: Sheet metal pitting! in reply to Andrew Z , 03-25-2007 12:53:53

Those fenders will sandblast without warpage. After cleaning, spray an epoxy high build primer with little or no thinner. Depending on the pit depth, two or three separate coats may be necessary. Hand sand with a block and 120 grit followed with 80.

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Andrew Z

03-25-2007 13:23:50

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Re: Sheet metal pitting! in reply to Wardner, 03-25-2007 13:10:25

Thanks guys, one of the fenders I think will require the bondo, yet one is not that bad Wardner where can I get this spray filler you mentioned? I think that will work for the one that has the less severe pits and seems easier than the bondo.

Thanks again

Andrew

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Wardner

03-25-2007 14:00:25

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Re: Sheet metal pitting! in reply to Andrew Z , 03-25-2007 13:23:50

It has been ten years since I have done any painting but I used to use DuPont Corlar 825S. All the paint mfgs have the 2 component high build primer. It is not considered a filler but can be used that way.

There was also a product called Featherfill. It was a filler/surfacer. I never used it, however. I used to buy Corlar by the pallet for painting large tanks. It is expensive, but all good paints are.

When I sprayed the Corlar for auto body work, I used to heat it to about 120-130 degrees. It would spray and flow out very nicely without thinners (xylol, I think). It can be used on very deep pits with excellent results. If you have mixed too much, you can put it in the freezer and it won't cure until it is removed, even several months later.

There should be info on the net regarding both products. Let Google do the searching.

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Wardner

03-25-2007 13:15:05

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Re: Sheet metal pitting! in reply to Wardner, 03-25-2007 13:10:25

Pardon me. That 80 followed by 120. Wet sanding with 220 works well too.

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