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PostPosted: Wed Aug 30, 2017 7:46 pm 
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Hi, I bought a marshalltown MPB165D PermaShape Broken-In Finishing Trowel 16" (22048) from screwfix on saturday. I have used it today for the first time and it as started to go rusty after I applied the first coat. It is now pretty bad for a brand new trowel. My other marshalltown trowel I have had for about 10 yrs and it hasn't got a spot of rust on it. Can anyone explain to me why this has happened please. I don't mind paying £56 for a trowel but it needs to last me.
Many thanks
Chris


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PostPosted: Wed Aug 30, 2017 8:11 pm 
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protecting-trowels-from-rust-t59839.html

Mike

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PostPosted: Wed Aug 30, 2017 11:42 pm 
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Could your old one be stainless?


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PostPosted: Thu Aug 31, 2017 5:51 pm 
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Hi Mate, yes it is, I didn't realise that this was carbon steel. I took it back and swapped it for a stainless steel one.


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PostPosted: Thu Aug 31, 2017 6:23 pm 
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If you are really into plastering then you might find The Plasterers forum.com a good source of info.

I read on there that if you have a carbon steel trowel you let it go rusty in a bucket of water or a vinegar and even coke when you have cleaned it up with sandpaper it forms a patina that is black and it will not rust again because of this.
http://www.plasterersforum.com/posts/1013884/

Mike

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PostPosted: Thu Aug 31, 2017 6:44 pm 
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London mike 61 wrote:
If you are really into plastering then you might find The Plasterers forum.com a good source of info.

I read on there that if you have a carbon steel trowel you let it go rusty in a bucket of water or a vinegar and even coke when you have cleaned it up with sandpaper it forms a patina that is black and it will not rust again because of this.
http://www.plasterersforum.com/posts/1013884/

Mike


The acid basically stops the rust/metal from oxidizing - most rust inhibitors/convertors are just a phosphoric acid, plaster being a corrosive alkali will speed up the rust (oxidisation) process


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