Building Plaster As 1st Top Coat Then Finishing Plaster

Discussion in 'Plastering and Rendering' started by BGRenovations, 9 Jun 2012.

  1. BGRenovations

    BGRenovations

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    Hi there,

    Have used search function but in a bit of a rush and couldnt find anything. Never plastered before in my life lol but have one wall which needs doing in my house. Thing is, I have 2 bags of opened plaster (opened about 2 weeks ago). Building plaster and satin finishing plaster. The problem is i only have a little bit of finishing plaster left and wanted to do 2 coats with it so can i use building plaster as the 1st top coat and then satin finish as the 2nd top coat?? Or can building plaster only be used for a render/ undercoat coat?

    Also, do i apply the satinfinish after the building plaster has semi dried or does it have to fully dry??

    Many thanks.
     
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  3. Micilin

    Micilin

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    I'm not sure of the products - do you have a link for them?

    Going blind I would say, building plaster for base coat and satin for finish. Satin to be applied when the base coat is firm and starting to change colour

    ?????????????

    There should be clues on the bags , a brief description of application and/or phone number and website for tech help.
     
  4. BGRenovations

    BGRenovations

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    Hi there, thanks for reply. Yes there's a website but it's all in Bulgarian and I don't have time to translate all of it, but to give a rough idea of what it basically says for satingips is:

    Pour plaster into clean water (1KG plaster to about 0.65L water). Let the plaster absorb the water for about 3-5mins. Then stir by hand slowly until it forms the correct consistency. Basically apply to wall, spread it out and you get 50 mins to use it.

    The plaster is then left to 'rest/ relax', I rather assume they mean to harden lol for minimum 2 hours so that it can be touched without causing deformations. Then polish the surface with a float with a sponge on the end of it. After it lightly sets to a matt surface, go over the surface again.

    But that's just how it's mixed and applied. I saw on the website it says for going over a rough surface (which is what i will be going over which is the base coat already there) to use two coats of satin with the 2nd being applied after the 1st one sets but as i said, i don't think ive got enough satin to do 2 coats. So do you know if i could substitute the first coat of satin for the building plaster which is just ordinary grey plaster and then finish with just one coat of satin when thats semi dry.

    My base is extremely rough you see thats why i need 2 coats of satin but i can't imagine id need 2 coats of satin if i apply a thin layer of undercoat ontop of the existing rough undercoat.

    Sorry if this confuses you, im confused myself lol if only i had a car to go and get another bag
     
  5. BGRenovations

    BGRenovations

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    Anyone? Please???
     
  6. Micilin

    Micilin

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    Working in the dark here so very hard to advise you.
    Is the base coat similar to the top coat ie does it have small lumps in it or is it a consistent powder?

    Is your intial coat very flat and closed in well?

    What thickness final coat do ou need to get on - can you do 2mm?

    Sorry, but I don't think you are being ignored - just that is is vortually impossible for anyone here to give an answer that is not just a guess.

    You need to talk to someone who has used the stuff .
     
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  8. BGRenovations

    BGRenovations

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    Hi I've found a picture of the building plaster if helps a little:

    [​IMG]

    And just says on the back:

    building gypsum Gray-white powder obtained by thermal treatment of crude gypsum rock. Hygroscopic building product applicable for use in dry areas, finishing, ability to form a plastic mass on mixing with water, the possibility of multiple use in construction. application: - In plastering, the substrate must be sound, dry, flat, without contamination from oil, dust and debris. - Gypsum is added to the prepared water, then stir until a homogeneous mass, water / gypsum - 0.6 to 0.8 parts by weight of water to 1 part by weight of gypsum.

    Doesn't say anything about the depth or anything about using with a topcoat product, although does state that this plaster can be used for finishing so maybe i can use 1 coat of this with 2nd coat satin. What do you reckon?

    Base is grey, top is white, both appear to be same consistency. Tricky to explain but i put my trowel in both of them and although there are little lumps, they break when i move them with my trowel if that makes any sense :confused:

    Yes, infact it's a great surface because it's like a cement render thats been on for years, but would require two coats of any sort of plaster as it's very course.

    I need to do two coats 2mm each which is normal isn't it I think. Because usually people start with undercoat on masonry, then two top coats of finishing plaster.

    It's ok, it's just im anxious to get started you see because I'm worried about the plaster going to go off soon as it's been opened and im in quite a humid area. I know it's irrelevant but just to cut long story short, english builder friend was doing a plastering job for me because he owes me money and half way through job we had a disagreement over what he'd be willing for me to take out of his wages and he basically went against what we'd originally agreed before he started the job so he has now walked off the job and now im left to plaster the other half lol, well, admittedly just 1 wall with what little plaster is left lol. He admitted that he hadn't even ordered enough top coat plaster :rolleyes:

    Don't worry if you're not sure, please don't be worried thinking that if it goes wrong I'm not going to be coming back and complaining :) I've asked other people and they dont seem to know either although they're not plasterers. If the worst comes to the worst I'll just have to scrape it all off and just start again with 2 coats of satin instead of 1 coat building plaster and 1 coat satin.

    So last but not least, if you had to guess, what do you reckon would be the worst thing that could happen? It can only start falling off the wall, in which case at least i wont have to scrape it all off by hand :mrgreen:

    Wish i could :(
     
  9. stevethespreader

    stevethespreader

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    sounds like you have a plaster similar to onecoat or kanauff if it can be used as an undercoat and a top coat im not sure what you would need that for if you already have render as a base coat, if it was me i would just
    use the finishing plaster straight over the render
     
  10. peaps2

    peaps2

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  11. BGRenovations

    BGRenovations

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    Yes but i don't have enough. I'd have enough to do one coat but the finish will be awful as it states on back of bag needs 2 coats if going over rough render. This is why i needed to know whether i can use just normal building plaster for the 1st and satin as the 2nd. And sorry if i wasn't clear, when i say 1st and 2nd coats i mean 1st and 2nd coats over existing cement render.

    Thanks peaps2. Will have a look. Problem is you have to wait 48 hours before you can be a member.
     
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