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28819 posts

Uber Geek

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#311159 19-Dec-2023 14:36
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The galv trailer has rust on the floor, due to me leaving damp compost on it for too long


Ive googled Rust kill and see most at Bunnings/M10 are more of a rust protection than killing although there are some rust converters


Any recommendations? In most places its 100% surface rust covered, do I need to sand it? If so I guess I can get an attachment for the cordless drill?


End of the day do the so called rust killers actually convert rust to a neutral ferrous solution as claimed?





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Uber Geek

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  #3173473 19-Dec-2023 16:30
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My suggestion would be:


-Wire brush on a drill to get rid of any rust that is loose. Use eye protection. Trust me on this.


-Rust converter applied liberally to any rust sections.


-Killrust primer.


-A couple of layers of some sort of hard-wearing paint.

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  #3173502 19-Dec-2023 17:47
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We just did this today on some rusted steel chair arms. Surface rust is easy. Sanded the rust by hand. Cleaned it. Then painted with rust convertor. When dry, sprayed with a can of spray grey primer from Bunnings. It came out a nice satin finish so two coats of that will be sufficient. Looks great. 

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Uber Geek

  #3173508 19-Dec-2023 18:42
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I used three of these when I did my trailer last year.


I took it back to bare metal all over ( was painted )


Then used rust kill to get any bits I missed.


Then painted ( brush )


Came up really well.


Sadly I could not keep it and had to sell it, what started as patching a hole in the plywood deck turned into a full reno.



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  #3173519 19-Dec-2023 20:33
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I have exactly this problem although not to the same degree you.. I've applied CRC rust converter to the rusty spots and will prime/paint when I get motivated.

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Master Geek

  #3173520 19-Dec-2023 20:47
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Try Black Guard.


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Uber Geek

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  #3173545 20-Dec-2023 07:07
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Thanks for the advice. The trailer guy called me back, they:



  1. ScotchBrite sander to take off loose rust
  2. CRC Rust Converter, they swear by it
  3. Any zinc paint


So a good consensus here. My issue was very few neutralised the rust. Ill get onto this in the holiday break


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Uber Geek


  #3173635 20-Dec-2023 11:43
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One more vote for CRC rust converter. Fantastic stuff. However, I prefer the paint on bottle rather than the spray can - the spray can always seems to clog up for me, no matter what I do (and I use quite a lot of spray cans and the turn upside down and spray until clear trick works great for everything else, just not CRC rust converter). Tipping a bit out and apply liberally with a cheap brush is just as quick. YMMV.


Your method sounds good. If you've got an angle grinder, I am quite the fan of the brumby strip discs for getting rid of rust. Then your choice of top coating system. CRC also has a Zinc spray. I've just been to check the spray cans and have quite a lot (and good experience) with the Zinc It range which I get from Bunnings. The CRC rust converter will act as a primer on bare steel and rust.


If you were doing the whole trailer, you could go for a two pack epoxy but if you're just touching up existing galvanised steel, rattle cans is probably all you need. 



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  #3173640 20-Dec-2023 12:11
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I had similar problem, but it was for my old switchboard panel at the back of my house. 
I even rang up CRC for advice.


Here is what i did. 


a. I basically clean out as much rust as i could.


b. at least two or three coats of the CRC rust convertor. 


c. I painted Dulux metalshield epoxy top coat on it. two coats (I think)

That was like two years ago. Till today, not a single dot of rust. 

On another note, I tried this but failed
a. clean the nail rust on the weatherboard to clear


b. applied CRC rust convertor twice


c. three coats of resene paint. 

Rust appear after six months.  

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