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Thread: Half-model

  1. #1
    Join Date
    Nov 2008
    Posts
    71

    Default Half-model

    Hi Guys
    I have a half model of my boat, which I obtained from a skip some years ago when the builder went bust. I want to make a copy for a friend who has the same class of boat. Is there anything that I could use to make a mould from easily - thinking plaster of paris or similar, that I could then pour something else into to create another model?

    Any ideas gratefully received - obviously I don't want to damage the initial model!

  2. #2
    Join Date
    Nov 2009
    Location
    Southampton
    Posts
    25,597

    Default

    Plaster of paris, after covering the model with clingfilm, seems reasonable to me. Or grease it and then splurge lots of silicone sealant over it, building up enough thickness to hold its shape once set. That'll give you a rubber mould which may release from the cast copy more easily.

    Pete

  3. #3
    Join Date
    Oct 2001
    Location
    Surrey
    Posts
    6,925

    Default

    Latex, you can get it in powder form from many art/model making shops. Try on line Theatrical make up suppliers. I've use it in the past to make casts of a few things. Then used casting resin to make the final item.
    Not expensive and you can use it on almost anything.............

  4. #4
    Join Date
    Nov 2004
    Location
    West Mersea. north Essex
    Posts
    2,731

    Default

    I was faced with. similar problem but a model aeroplane not boat.

    I used papier mache - actually newspaper soaked with wallpaper paste. Tip - don't get it too wet or it all disintegrates

    Excellent result. Slightly flexible so easier to pull off the object than plaster of paris
    davidej

  5. #5
    Join Date
    Jul 2009
    Location
    Lefkas Island, Ionian Sea, Greece.
    Posts
    357

    Default modeling


  6. #6
    Join Date
    May 2006
    Location
    IoW
    Posts
    3,716

    Default

    Silicone rubber is often used, especially if there are returns on the shape which make a one-piece plaster mould impossible.
    http://www.ecfibreglasssupplies.co.u...-silicone.aspx for the materials and http://www.ecfibreglasssupplies.co.u...ndCasting.aspx for a video tutorial.

  7. #7
    Join Date
    Aug 2007
    Location
    Côte d'Solent
    Posts
    2,406

    Default

    Plaster of paris gets pretty hot when setting IIRC, especially if there's a fair bit of thickness to it, probably best to make sure the model is thermally stable
    Are we there yet?

  8. #8
    Join Date
    Jan 2008
    Location
    Oxfordshire / Solent
    Posts
    2,841

    Default

    Take the lines off your half-model and carve another one - huge satisfaction.
    http://www.smiletrain.org.uk - charity for child cleft palate surgery

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