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[Shop-talk] Etching bare metal

To: Shop Talk <shop-talk@Autox.Team.Net>
Subject: [Shop-talk] Etching bare metal
From: Jim Stone <1789alpine@gmail.com>
Date: Sun, 13 Nov 2022 16:19:23 -0500
Delivered-to: mharc@autox.team.net
Delivered-to: shop-talk@autox.team.net
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The last time I painted a car was in the 1980=E2=80=99s, which I=E2=80=99m=
 pretty sure is before the invention of self-etching primer.  If it was =
around then, I didn=E2=80=99t know about it.  I learned everything I =
knew from reading DIY books and used a phosphoric acid solution to etch =
bare metal before priming.  I haven=E2=80=99t heard of anyone doing that =
anymore, but need to prime a trunk lid and am thinking it might be worth =
a phosphoric acid wash first.  I had the lid dipped about 10 years ago =
and it was left untreated all this time.  (Not by me, but that is a =
different and longer story.)  The lid has been sitting on the car and =
the underside still looks nearly perfect.  The car with has always been =
garaged but the top had a light coating of rust.  I=E2=80=99ve removed =
that now but there are some pits here and there (probably from before =
the dipping) and I would like to be 100% sure it is rust free before =
priming it. =20

I have a gallon of this sitting around: =
https://www.amazon.com/Klean-Strip-GKPA30220-Gallon-Phosphoric/dp/B00945D1=
5I =
<https://www.amazon.com/Klean-Strip-GKPA30220-Gallon-Phosphoric/dp/B00945D=
15I>  Is there any reason not to wash the surface with a diluted =
solution before priming?  Or, should I just use something like =
Rust-Oleum Rust Reformer =
(https://www.rustoleum.com/product-catalog/consumer-brands/auto/removers-a=
nd-chemicals/rust-reformer-spray/ =
<https://www.rustoleum.com/product-catalog/consumer-brands/auto/removers-a=
nd-chemicals/rust-reformer-spray/>) and call it a day?=

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<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html; =
charset=3Dutf-8"></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; line-break: after-white-space;" class=3D"">The =
last time I painted a car was in the 1980=E2=80=99s, which I=E2=80=99m =
pretty sure is before the invention of self-etching primer. &nbsp;If it =
was around then, I didn=E2=80=99t know about it. &nbsp;I learned =
everything I knew from reading DIY books and used a phosphoric acid =
solution to etch bare metal before priming. &nbsp;I haven=E2=80=99t =
heard of anyone doing that anymore, but need to prime a trunk lid and am =
thinking it might be worth a phosphoric acid wash first. &nbsp;I had the =
lid dipped about 10 years ago and it was left untreated all this time. =
&nbsp;(Not by me, but that is a different and longer story.) &nbsp;The =
lid has been sitting on the car and the underside still looks nearly =
perfect. &nbsp;The car with has always been garaged but the top had a =
light coating of rust. &nbsp;I=E2=80=99ve removed that now but there are =
some pits here and there (probably from before the dipping) and I would =
like to be 100% sure it is rust free before priming it. &nbsp;<div =
class=3D""><br class=3D""></div><div class=3D"">I have a gallon of this =
sitting around: <a =
href=3D"https://www.amazon.com/Klean-Strip-GKPA30220-Gallon-Phosphoric/dp/=
B00945D15I" =
class=3D"">https://www.amazon.com/Klean-Strip-GKPA30220-Gallon-Phosphoric/=
dp/B00945D15I</a> &nbsp;Is there any reason not to wash the surface with =
a diluted solution before priming? &nbsp;Or, should I just use something =
like&nbsp;<span style=3D"caret-color: rgb(34, 34, 34); color: rgb(34, =
34, 34); font-family: &quot;Helvetica Neue&quot;, Helvetica, Arial;" =
class=3D"">Rust-Oleum Rust Reformer (</span><a =
href=3D"https://www.rustoleum.com/product-catalog/consumer-brands/auto/rem=
overs-and-chemicals/rust-reformer-spray/" =
class=3D"">https://www.rustoleum.com/product-catalog/consumer-brands/auto/=
removers-and-chemicals/rust-reformer-spray/</a>) and call it a =
day?</div></body></html>=

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