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GO - 24 Sep 2006 11:40 GMT

Can you myth bust this?

A friend of mine says that leaving primer on a car doesn't prevent water
from getting into contact with the metal. He believes primer is porous?

Any comments?

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Nate Nagel - 24 Sep 2006 12:24 GMT

> Can you myth bust this?
>
> A friend of mine says that leaving primer on a car doesn't prevent water
> from getting into contact with the metal. He believes primer is porous?
>
> Any comments?

It's not a myth, it's true. The only primers that are suitable for long
term exposure to the elements (i.e. long term project stored outside)
are epoxy primer/sealers such as DP-90. Regular parts store rattle-can
lacquer will rust the metal almost as fast as nothing at all. So if you
have a long term project that the bodywork is not complete on, and you
need to "hold" the metal for a long time, overcoat the primer with some
cheap flat black spray paint or something.

nate

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GO - 24 Sep 2006 13:22 GMT

Thanks.

>> Can you myth bust this?
>>
[quoted text clipped - 13 lines]
>
> nate

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larry moe 'n curly - 25 Sep 2006 03:39 GMT

> > A friend of mine says that leaving primer on a car doesn't prevent water
> > from getting into contact with the metal. He believes primer is porous?

> It's not a myth, it's true. The only primers that are suitable for long
> term exposure to the elements (i.e. long term project stored outside)
> are epoxy primer/sealers such as DP-90. Regular parts store rattle-can
> lacquer will rust the metal almost as fast as nothing at all.

What about lacquer finish coats? Makers of car covers warn not to use
their covers over lacquer paint jobs, so does that mean they can't be
used on GM cars?

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phaeton - 25 Sep 2006 23:11 GMT

> DP-90

If only I had the ways and means to effectively sandblast my truck and
then shoot it with this. I'd wetsand it to a low 'wood stove' sheen
and leave it just like that. It's great stuff, and IMHO it looks real
nice.

YMMV

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Scott Dorsey - 24 Sep 2006 13:50 GMT

>Can you myth bust this?
>
>A friend of mine says that leaving primer on a car doesn't prevent water
>from getting into contact with the metal. He believes primer is porous?
>
>Any comments?

It's true. Ask your paint dealer for the manufacturer's data sheet.
--scott

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"C'est un Nagra. C'est suisse, et tres, tres precis."

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TeGGeR® - 24 Sep 2006 14:13 GMT

> Can you myth bust this?
>
> A friend of mine says that leaving primer on a car doesn't prevent water
> from getting into contact with the metal. He believes primer is porous?
>
> Any comments?

It's true.

Zinc-based primers will resist rusting better than the regular stuff, but
should still never be left uncovered.

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TeGGeR®

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