Temporary fix for rust spots on steel deck

[rognvald]

And the reason you cannot leave it until Spring and repair it correctly?

[FlyingCloud1937]

This aka PNW Fishermans Friend.

It really works, I can attest to that, they make a couple of different Rust Reformer products, just make sure it's V2100.

Lloyd

High Performance

V2100 System Rust Reformer Spray

Technical Data Sheet

Rust-Oleum® High Performance Rust Reformer® is a specially
formulated coating containing a silane additive which is
capable of reacting with iron oxide in the rusted steel. Once
reacted with iron oxide the desiccant action of the silane helps
inhibits further oxidation. Rust Reformer is for use on sound
rusted steel surfaces and is not intended for use on clean metal
or galvanized steel. The material dries to a hard black finish. A
top coat is optional. Use when temperature is above 35°F (2°C) and humidity is below 85% to ensure proper drying. Surface temperature must bebetween 35-100°F (2-38°C).

[rognvald]

"Use when temperature is above 35°F (2°C) and humidity is below 85% to ensure proper drying. Surface temperature must be between 35-100°F (2-38°C). " Flying Cloud


Cloud,
Will this work in the OP's stated conditions: raining every 3 hours?

[peter57]

Originally Posted by Wotname

Disclaimer: I'm not a paint chemist, just a DIYer who once had a steel boat

As I understand it, a zinc rich primer provides galvanic protection and in order to do so, must be in direct electrical contact with the base steel i.e. applied directly to a clean bare steel surface. Phosphoric acid reacts with rust (Fe2O3) and converts it to FePO4 (ferric phosphate) which is in effect an insulating layer between the steel and the paint. In addition, anywhere the phosphoric acid was applied to clean steel, no reaction occurs and unless the acid is completely removed, the remaining acid will react with the zinc content of the paint.

You might find a better explanation here Frequently Asked Questions - Galmet.

All the info I have read on zinc primer application suggests it is not a good idea but I am always open to a well reasoned dissenting viewpoint.

Wotname has my vote. Rich Zinc primer which becomes the anode and drys instantly here in Queensland, and does need another primer before filling and top coat.

Acid rust converters just cause more problems and stains other top coats as it runs easily. I wish it was never invented as the previous owner has used it and has made a mess of things and had to grind it out and there is rust between it and the steel and now I know why the Pro in our yard told me never to use it.

[svseachange]

I'm using Jotun Jotamastic 90 (two pot primer) and so far so good. Rich zinc primer did not work well for me.

Would like to hear more about what other are using.

[rwidman]

I'm just wondering why the rust didn't bother you until it was too cold to deal with it properly.

[zeehag]

tarp the topsides so water isnt your enemy.
wire brush and rustoleum.
in dry season-- fix it.

[peter57]

Originally Posted by svseachange

I'm using Jotun Jotamastic 90 (two pot primer) and so far so good. Rich zinc primer did not work well for me.

Would like to hear more about what other are using.

I was told that the "2 pack Primer" is really good and to have a go using it but have not as yet, so I can not comment. I was also told that the 2 pack is more resistant at wear places "fair leads ect."

Thanks for naming the product you are using with success.