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Thread: Rust spot on plaster

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    Rockcrawler's Avatar
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    Rust spot on plaster

    Not sure where I was supose to post this one, I noticed today while vacuuming my pool that I have a small rust spot, size of pencil eraser, but very noticable, it looks like it was from an object rather than a chemically induced stain. What is the best way to remove the stain, it is on plaster.

    Thanks

    Rob
    13,000 IG Plaster, 2hp whisperflo pump, 48 sq in pentair DE Filter, 1 skimmer, 2 eyeball outlets, 200 sq ft solar panels on second story, Auto Pilot SWG-36, Polaris ATV Cleaner

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    Mod Squad JohnT's Avatar
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    Re: Rust spot on plaster

    Vitamin C tablets are great rust removers. If it's on the floor, just lay the tablet on the spot (easier said than done). If it's on the wall, rub the spot with the tablet.

    Before doing anything, examine the spot closely to be sure it isn't rebar installed too close to the surface.
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    Rockcrawler's Avatar
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    Re: Rust spot on plaster

    Thanks John, man if its rebar then there is a real problem
    13,000 IG Plaster, 2hp whisperflo pump, 48 sq in pentair DE Filter, 1 skimmer, 2 eyeball outlets, 200 sq ft solar panels on second story, Auto Pilot SWG-36, Polaris ATV Cleaner

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    AV8TOR's Avatar
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    Re: Rust spot on plaster

    Quote Originally Posted by JohnT
    Before doing anything, examine the spot closely to be sure it isn't rebar installed too close to the surface.
    Interesting - what do you do then?

    I have heard of the wire ties that that twist the rebar together poking through.
    16,000 gal IG Double Roman Plaster Pool (16yrs - plaster redone 2014)
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    Re: Rust spot on plaster

    Quote Originally Posted by AV8TOR
    Quote Originally Posted by JohnT
    Before doing anything, examine the spot closely to be sure it isn't rebar installed too close to the surface.
    Interesting - what do you do then?

    I have heard of the wire ties that that twist the rebar together poking through.
    I might rephrase the above statement. The rebar would not have been installed to close to the surface, the shotcrete or gunite and plaster would have been applied too thinly over that rebar.

    If that were the case, or if a tiewire was poking through, it would require some plaster repair. If the surface is just white plaster, it would be easier than if it were a premix color, or an aggregate mix finish. All doable, though.
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    AV8TOR's Avatar
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    Re: Rust spot on plaster

    So can you skim coat over the existing plaster then?
    16,000 gal IG Double Roman Plaster Pool (16yrs - plaster redone 2014)
    Pentair FNS-48 DE filter with WhisperFlo 2HP single speed pump
    Polaris 280 robot
    BBB all the way and tested with a TF100 kit
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    Re: Rust spot on plaster

    Quote Originally Posted by AV8TOR
    So can you skim coat over the existing plaster then?
    Are we talking white marcite finish? If so, as long as you can get a product that bonds with the existing plaster, it is possible. I'd defer to one of the plaster experts on this forum. This is not my area, but I can do some quick research on products that claim to fix this problem. BRB.

    On Edit: A hydraulic cement can be used to plug any holes, etc., but this repair product category is not the same as the plaster. I'd consult a better tech source.
    http://www.swimmingpool.com/

    "Leave the gun...take the cannolis"

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    Re: Rust spot on plaster

    Oxalic acid works well as a rust remover. Sold as Bar Keepers Friend.

    I would test it on an out of the way piece of plaster first.

    It is a great rust remover for tools. Does not attack iron or steel.


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