I have the OMS 98s as well.  So far no problems. 

In the past I have re-painted some older 72s which were originally
plastic coated.  (That stuff is a pain to get off the tank).  Anyway, 
I ended up going to my local automotive paint dealer and obtaining
some conversion coating liquid for about $15.00.  This is an almost
clear liquid which when applied to the metal cuases a thin coat of
zinc oxide (if I remember correctly) to form on the metal.  You just
paint it onto the bare metal with a brush and let it sit a few
minutes.  Then rinse with clean water.  Rinsing well is important
since this stuff contains acid.  Anyway, once the tank dries there
will be a whitish haze on the metal.  This is the zinc oxide which has
chemically bonded to the metal.  This coating apparently has two
purposes.  One it is a corosion inhibitor but it provides a better
surface for the paint to ahdere too. You then prime and paint as normal.

So far these tanks have performed well for me.

As always don't get this stuff or the paint in the tank or valve.

Mat.

---Elinor Lucas & Matt Abramovich <lucasabramovich@sp*.ca*> wrote:
>
> 
> -----Original Message-----
> From: Mark Melendez <melendez@bi*.co*>
> To: <techdiver@aquanaut.com>
> Date: February 2, 1999 7:04 P
> Subject: Rust spots on OMS 98....
> 
> 
> >Anyone know what the best method would be for dealing with small
rusting
> >areas on the *exterior* on OMS tanks? It seems that the coating had a
> >small pinhole which allowed moisture to reach the metal.
> >
> >Has anyone else had this problem?
> >
> >--
> >~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> >Mark Melendez
> >melendez at bigfoot dot com
> >http://www.bigfoot.com/~melendez
> >--
> 
> Mark,
> 
> I've got OMS 98's also.  I haven't had this problem yet but I keep a
close
> eye on them for rust.  There are some chips that go down to the bare
metal,
> but I've found that clear nail polish works well to keep out the
rust.  I
> gusee the only thing you can do it treat it like a body job on the
car.
> 
> First sand down the rusty area till clean metal comes up, clean with
methyl
> hydrate, not varsol, and prime it.  Allow to dry and prime again, then
> paint.  Allow paint to air cure and don't heat the tank (i'm sure
you know
> this already!).  Don't forget to tape over or cover up the valves so
you
> don't get metal dust or paint in them.
> 
> HTH
> Matt
> 
> 
> 
> 
> 
> >Send mail for the `techdiver' mailing list to
`techdiver@aquanaut.com'.
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`techdiver-request@aquanaut.com'.
> >
> 
> 
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