Boy, I hate these trailers
-------- Original Message --------
Subject: Re: Replacement Panel Primer
Date: Thu, 26 Jun 2003 22:10:09 -0400
From: Don Malling <dmallin@attglobal.net>
To: "Dodd, Kelvin" <doddk@mossmotors.com>, "mgs@autox.team.net"
<mgs@autox.team.net>
References: <2DEF596095A60F4981A459678583AE83EE3ECD@MOSSEX1>
Hi Kelvin,
I remember Kai's response. I asked again hoping there may be some new
news out there. There is no evidence of rust anywhere on this shell.
There is even a "scratch" on the door -- looks like maybe when the outer
primer was still wet, but even on very close inspection no rust.
Not withstanding what Kai said, I am confident that the dip primer works
and these cars are pretty well protected, but the question of the inner
sills has always bothered me. After reading in Lindsay Porter's books
about how the sills are put together it seems pretty clear that there is
exposed metal inside unless the dip primer reached it. I'm hoping that
is the case, and that it entered and exited through the water "weep"
vents in the bottom of the sills. Although I can believe that air could
have been trapped inside the sills and kept the dip out. Maybe they dip
them upside down :-) I bet not.
I keep thinking that I should, or better yet should have a long time
ago, sprayed inside the sills with WaxOyl, or something of the kind.
I'm getting together a long wand and garden pressure sprayer to spray
WaxOyl inside my TR250 frame so maybe now is the time. Better late than
never.
Don
Dodd, Kelvin wrote:
>>I have a similar question relating to my "new" BMH MGB Body
>>Shell which
>>is still in it's crate and has been waiting for me in the
>>garage since 1991.
>>
>>My understanding was that these new body shells were dipped in modern
>>primers during manufacturing. On close inspection it appears
>>there are
>>two primers on this shell. A darker gray which appears to be
>>"thinner"
>>and can only been seen inside the shell members, where it was hard to
>>reach with spray, and an outer lighter gray, and thicker,
>>primer which
>>appears to have been sprayed over the darker coat.
>>
>>I have two questions:
>>
>>1. Can these two primers be used as a base coat after proper
>>sanding and
>>surface prep?
>
>
>
> To my knowledge. Yes. When they were building up complete cars,
> they never stripped all the paint off.
>
>
>
>
>
>>2. What if anything was done to the inner sills during manufacturing?
>>After or before welding were these protected in any way?
>>Would the dip
>>primer reach them, or are they unprotected and have been rusting away
>>while sitting in the crate these 12 years?
>
>
>
> This is a very good question. Kai pointed out that he knew of a BMH
> shell rebuild that started to rust after only a few years. This
indicates
> that the rust proofing is not dependable.
>
> I would strongly suggest going in after the car is painted and
> protecting the interior of the rockers with a spray on coating. You
could
> do this now, but you have to make very sure all the goo gets out
before you
> spray the car. Better to spray the car first, then goo.
>
>
> I think you will find the thin primer is from the dip tank. Then
> when the outer body panels were assembled, the assembly roughness and
> transport dings were filled, then the whole body shell coated in primer
> surfacer. At this point the shell should really be sanded down by
someone
> that knows what they are doing, so any metal-primer problems get
sorted out.
> This does not mean going down all the way to metal, but down far
enough so
> the new etch prime coat can adhere well.
>
> I would strongly suggest taking this up with a good body man who
> knows their materials. That is the only way to get a reliable answer.
>
>
> K.
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