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Thread: what is the best afordable paster for lost wax

  1. #1

    what is the best afordable paster for lost wax

    Hi all,
    Now for my next question Plasters range in price for a couple of £ to large amounts. I want something that will produce a good cast from lost wax. I can get board finish plaster for next to nothing. Plaster of paris is more expensive but affordable and then we start getting on to the expensive and very expensive stuff. I will try an experiment with the cheap stuff but what is the name of a reasonably priced investment powder I can get easily in the UK ?

    Thanks

  2. #2
    Senior Member Zapins's Avatar
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    What metal will you be casting?

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    I use plain plaster of Paris for all of my lost wax work in bronze. I mix it one part plaster to two parts silica sand.

    Richard
    When I die, Heaven can wait—I want to go to McMaster-Carr.

  4. #4
    I have only tried this once but used this product from Artisanfoundry.co.uk
    https://www.artisanfoundry.co.uk/pro...roducts_id=330
    Worked well, here's the video-

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    Quote Originally Posted by myfordboy View Post
    I have only tried this once but used this product from Artisanfoundry.co.uk
    I agree with myfordboy, i have used industrial A investment plaster for years for bronze casting and have had no problems with it. I buy it at specialplasters (based in Birmingham UK) as its a bit cheaper (about £27 for 22.5kg). It doesnt need sand added, just be accurate with the water amounts.
    http://specialplasters.co.uk/foundry...nvestment.html
    In the beginning i did try the method rasper uses with 2 parts sand to 1 part POP. It is a lot cheaper than the specialised stuff but I couldnt get it to work consistently enough without cracking for my purposes.

    John

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    Please add your location to your profile. Questions about getting things are difficult without it.

    For investing wax originals I would go with the good stuff. You only get one shot at it.

    I have not tried this but to go cheap and get a nice finish texture try coating the wax with the good stuff then investing in the cheap stuff. Spray the wax with debubbler, dishwasher anti spotting additive can be used, prior to investing or coating. If the coating works you can try adding grog to the DIY investment to help with the cracking.

    .

  7. #7
    Artopsy,
    I could not see any info on the amount of water to use. Do you have the details. Also do you add water to the plaster or plaster to water?

  8. #8
    I'm certainly no plaster expert but I always add plaster to the water, when I've done it the other way around, it tended to set up prematurely.

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    I put the water in a white bucket and stick this mixer in and while mixing I add the plaster in a stream and then the sand in a stream to prevent clumping. (This photo was attached from Photobucket and it is visible right now. We will see.)



    Edit note: Photobucket disappeared it so I linked it to my Spider Oak server.

    Richard
    Last edited by Rasper; 09-10-2017 at 04:06 PM.
    When I die, Heaven can wait—I want to go to McMaster-Carr.

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    Quote Originally Posted by myfordboy View Post
    Artopsy,
    I could not see any info on the amount of water to use. Do you have the details. Also do you add water to the plaster or plaster to water?
    Powder/water ratio 100/28

    I add plaster to water, sprinkling it in.

    The spec sheet for work/setting times at the link below

    http://www.srs-ltd.co.uk/products_se...nvestment.html

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