High Build Masonry Paint

Discussion in 'Decorating and Painting' started by Haven`t a clue, 2 Oct 2005.

  1. Haven`t a clue

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    Hi
    I am trying to apply a coat of high build masonry paint to the walls on my house which are rendered.Is it possible to get a smooth finish by troweling it on and then smoothing over with a float?I don`t really want a textured finish which I get with a roller,is there one that will give me a smoother finish?I have tried various densities of foam and lengths of pile.
    After I troweled it on I am finding it almost impossible to not leave any marks with the float and to get it on even.Any tips would be most welcome. :confused:
     
  2. jbonding

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    its a textured finish but if you try a stipple pad once its troweled on, the stipple is not that thick, have you tried a sponge tapped on it very lightly?
     
  3. Haven`t a clue

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    Yea tried a sponge,still couldn`t get it right though.Could you tell me exactly what a stipple pad is please?In the sandtex book it says spray on is an option,might have to try that.
     
  4. jbonding

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    a stipple pad looks like a plastic float with hundreds of little rubber bits sticking off it im sure someone on here can add a link. its still stippled but not as stippled as a roller.
     
  5. paintycait

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    H.A.C.
    You would be better to post all the information that you posted on the other forum...that info helps people get a handle on what you are trying to achieve. I know I couldn't give you the answer to your problem but hopefully you will get it here from others.
    Cait
     
  6. Haven`t a clue

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    Ok,this is what`s posted on the other forum

    can i ask y u r using a high build paint
    y
    don t you use a weather shield or sandstone paint by far the easiest to get good coverage on the walls
    apply to coats by roller and hey presto your done

    Not sure what you are trying to do here. A high build paint by it's nature is less easy to get smooth, it is likely to hold a texture (I am assuming this is an acrylic or emulsion paint you are using here, you've mentioned no brand names). There are a few finishing products that can be troweled but most have a lime content and are very specialised. Look to Oikos Bluebell and Lafarge Italia for advice regarding these.
    As Forest says you would perhaps be better looking at a high quality masonry paint like Sandtex Ultra Smooth or some of the other Akzo Nobel Masonry coatings.

    Yea I am using this because I have just had to put new wall ties in my house.The old ones had rusted away in places so I did them all.Where I removed the old there were fair sized holes to fill and I have found it impossible to match them up to the existing render when filling them.I didn`t want to rerender the whole house so looked at this as an alternative.I have tried covering where the holes were with dulux(textured and smooth)weathershield,but it`s still obvious where the holes were.I am using sandtex high build and it gives me ezactly the finish I want except for the lines left at the edges of the float.Any suggestions please?

    Knowing more about what you are trying to do helps to understand your approach a lot more. The key to most successful touchups is to fill...only the area that has the hole and no more, to smooth...only the area that you filled and no more and to paint...only the area that was filled and no more...but given that you have already done the filling and tried the painting and that the holes are many and various, I have a funny feeling you will now never get a match. You could try using a damp soft bristled brush to dust back the edge but I suspect that you will end up with a sheen difference whatever you do. I would suspect that you will need to paint the whole wall again and even this might not "lose" the filling completely but would probably detract the eye from the problem areas.
    This is a tough one without seeing it. Sorry I can't be of more help.

    Thanks for your reply.It is a very tough one,I have tried just about everything to get a match,but couldn`t so decided the only way to sort it was to go over the whole lot with something thick enough that it wouldn`t show through.The high build gives me exactly the finish I want except for the marks left by the float,so annoying!!I do have a photo of one side of the house,can do some more tomorrow if they would help.This one probably not close up enough. http://photobucket.com/albums/b262/Stressed1/?action=view¤t=DSCN0601.jpg
     
  7. paintycait

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    HAC, These are the bits I think are important....it's the fact that it's a patching in job that is the most relevant bit

    ZAMPA!!!! where are you. I've suggestd on another forum that this guy just get everything the same texture and then coat over to make the whole thing look even...any further ideas?

    Cait
     
  8. Zampa

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    Hmmm....tough one this, I have used high build but I dont think it was the stuff your using HAC you certainly couldnt trowel it on.

    Brolac used t make a stuff.....the sort of finish you see on portacacbins etc..you can roll that on

    Sadtex or rather blue circle also made a product......yo mixed it yourself and by doing so you could control the thickness.....im sorry i cant remember the name.

    I am not 100% sure what what you are trying to achieve, but if your trying to hide the trowel marks and/or match in the texture..what about the old fashion style hand brush...the stiff ones with natural filling..try that..if its just blend in with the existing surface ten dip it in water and dab around the edges.

    Or you can use it to create your own effect.

    Cait, your suggestion would be my first option too..match in the surface using whatever it takes....then coat the whole thin up in masonry paint...using highbuild to do the lot ..especially over render could cost a fortune.....and it may not take to the render.
     
  9. jbonding

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    alright havent a clue dont worry about the trowel marks you should get them out with the roller. dont use the stuff like your skimming a wall all you do is cover the render with the hi-build a very tight coat, try and take off as much as you can and let the roller do the work. what kind of roller are you using?
     
  10. Haven`t a clue

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    I have tried various rollers but have found the best so far to be a foam gloss roller.I have been applying it as if I am skimming a wall,will try what you suggest.Also do you know of a better roller please?
     
  11. Zampa

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    There are better rollers to be had....artex do one with a sculptured surface.

    Im trying to work out what you really want to achieve effect wise...are you trying to get a finish similar to the rough cast?
     
  12. Haven`t a clue

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    Zampa
    I am trying to get a finish like I have on the extension to the house.This is just rendered,then sponged to bring out the sand.I can post a photo tomorrow if that would help?If I can`t get that finish I will have to use a roller and have a rougher finish,although I would prefer the other.
    Thanks for all the replies.
     

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