In the middle of all the coulda, woulda, shouda messages would anyone care to recommend a good prep or primer for metal that has been needle scaled. This would be for steel that is not shotblasted to white.

lamontdc@adelphia.net

At IRM, we generally use Rustoleum damp-proof red Rusty Metal primer. This also seems to work very well on wood.

frank@gats.com

If you want to go with an automotive type primer, PPG products has a corrosion resistant primer called "DP" which is very good. In the past I've also had excellent results with DuPont's two-part acid-etching primer #515 (#516 for the acid).

good luck,
Brian Wise
Benton, KY

midsouth@mail.com

> In the middle of all the coulda, woulda,
> shouda messages would anyone care to
> recommend a good prep or primer for metal
> that has been needle scaled. This would be
> for steel that is not shotblasted to white.

Funny you should ask. I used to use fish oil based red rust primer but can't find it anymore. Now doing an exterior job on a heavyweight Pullman hulk for which the spec is "make it less embarrassing" and trying out two techniques.

One - use OSPHO rust converter covered with rustoleum primer and plain oil based cover paint.

Two - use the primer itself over the metal with no converter and same covercoat.

In both cases the cleaning has been the same - wire brush off the loose rust, chalking, dirt and paint leaving all secure coatings in place.

Ask again in 5 years and we should have some comparitive results.

Dave


irondave@bellsouth.net

Try POR15, It is gauranteed against rust even when applied over rust. They have a web site and will send a catalog. Try POR 15 on the search engine

robert@trainorders.com

> Funny you should ask. I used to use fish oil
> based red rust primer but can't find it
> anymore. Now doing an exterior job on a
> heavyweight Pullman hulk for which the spec
> is "make it less embarrassing" and
> trying out two techniques.

If you are talking about the Rustoleum mentioned above, it is available through Grainger. Just picked some up a couple months ago.

Todd Jones

Restoring MILW E9 33C
milw104c@charter.net

Is the Search Engine rusty too?? Sorry, I couldn't resist.
POR 15 has a good reputation, as does the DP series from PPG.
On WP 805A there was a lot of rust on the roof and a great desire to avoid sandlasting. There was also a bunch of cooling pipes mounted, so no easy to get to flat surface. Cleaned off the loose rust and applied POR 15, then the usual automotive top coats. So far (some 6 years) I have not heard of any rust showing up, but I will admit, I personally haven't been back on the roof to check it out.
S'
David D.


djdewey@cncnet.com

Gentlemen, I thank you! Thats a good list of recommendations to work with. We used to depend on penetrol, a fish oil based additive. Before they ruined it, you could paint it on over brushed off rust and it would literally soak in and convert the rust to iron oxide primer. it would soak around rivets and seams and really stop rust. The old formula would always take 48hr to set up. The new formula dries like paint and just does not last.

Again, thanks


lamontdc@adelphia.net