Hi Gary and list,
rust requires 2 things to develop, moisture and air.
While is it relatively simple to deny metal air(oxygen), sealing out
moisture is a real challenge.
In areas like you describe, I would wire brush or media blast the
surface back to bare steel, cut out any perforated areas, replace with
metal patches and treat with a metal prep product such as
De-oxidine/Metal Conditioner (a Phosphoric Acid type
convertor/degreaser).
Once treated, rinse with clean water, spray all areas and crevices
with Methylated Spirits (de-natured alcohol) and blow dry with
de-humidified compressed air.
Use a heat gun too if you really want to dry everything completely.
Then use a good quality etch primer to cover all bare areas.
Thin it well so it creeps between the panels.
>From there on you can use a Seam Sealer to exclude further moisture.
BUT, there is an old Eskimo saying that goes: -
"You can seal water IN, but you can not seal water OUT!"
So be careful if you decide to use a Seam Sealer, copious amounts of
primer and topcoat may be all that is required, especially the under
hood where the environment is USUALLY protected from rain and airborn
grit and is kept warm by the engine heat.
There are no guarantees, but it will be better than what was done in
the factory 30+ years ago!
Regards,
Graeme Suckling
1965 SP310 - under construction DSOA Member # 112
1971 P510 4 door - daily driver, original owner, highly modified.
1972 PL510 2 door - in storage.
1973 HS30/240Z - re-building to 2003 specs.
http://www.imagestation.com/album/?id=4290669159
Adelaide, South Australia.
-----Original Message-----
From: owner-datsun-roadsters@autox.team.net
[mailto:owner-datsun-roadsters@autox.team.net]On Behalf Of Gary Boone
Sent: Friday, 5 September 2003 4:22 AM
To: datsun-roadsters@autox.team.net
Subject: Hood rust
Hey gang,
I've had recurring problems with rust popping through on the leading
edge of my hood. After grinding out the rust bubbles in one area, I
found that the rust is originating between the hood sheetmetal and the
reinforcing plate that's welded on the underside near the corner of
the scoop. It's heavy scale rust with lots of metal loss. I suppose
the factory didn't take adequate precautions to prevent this problem.
There are also other bubles popping up on the leading edge remote from
the reinforcing plate. Anyway, I found a NOS hood and am wondering if
there is anything I can do to prevent the problem, prior to having the
new hood painted.
TIA,
Gary Boone
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