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Casting Latex from Home Depot

Discussion in 'Molding and Casting' started by Drewtherebel, Aug 23, 2008.

  1. Drewtherebel

    Drewtherebel New Member

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    Can latex caulk be poured into a silicone mold for casting purposes? I know this is probably one of those questions that will have some of you shaking your heads, but it's all I can afford at the moment.
     
  2. Ravenson

    Ravenson New Member

    Ok I do not think it will work. First check and make sure the latex caulk is really latex and not a silicone caulk. If it is use a very good mold release and try it on a mold you do not care about. I think one of the problems you are going to have it getting the latex to cure in the thicker parts and getting it to hold its shape. If it does work let us know and post pictures
     

  3. Drewtherebel

    Drewtherebel New Member

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    cheers for the encouragement. I guess I am looking at doing things without having to spend a hundred bucks everytime I want to try. I have looked into making polymers at home - not much luck there
     
  4. bill@hogheaven

    [email protected] New Member

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    Molding & casting is expensive. Get used to it.
     
  5. Amy

    Amy Mammal artist

    Yeah, I think you're going to have problems with the latex not hardening all the way through.

    I have no idea what you are trying to make, but if you don't need your cast piece to be flexible, try a polyurethane casting resin like Easy-Flo 60.. click here:

    http://www.uscomposites.com/moldmaking.html#resin

    I haven't personally used this product yet, but I have used Por-a-cast which sounds very similar (but was more expensive). The reason I give you this link is because you can buy a 16 oz. kit for $12 so you don't have to invest alot of money if this is your first time casting.

    This stuff would work great in a silicone mold. It is rigid once it hardens, but since your silicone mold is stretchy, you should be able to demold with no problem.

    Check out the other stuff on the US Composites site too .. they have alot of molding and casting stuff at great prices.
     
  6. You guys are right about the expense. Whew!!!!!! I have not made my first mold yet and have at least $200.00 in material. Frank.
     
  7. EJ

    EJ Proud Member of: Unaffiliated, Free Agent

    Just wait until you start casting with dental acrylics. Your wallet will stay empty! ;)
     
  8. Drewtherebel

    Drewtherebel New Member

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    HEY GUYS - I found this moulde/casing making recipe on the next and am going to give it a try - seems like 5 bucks worth of material. If any of you guys try this out let me know how it goes.

    FLEXIBLE MOLD COMPOUND
    This is new mold material is much superior to ordinary gelatin (mold glue) and is very easily made. It does not shrink or dry out like ordinary casting gelatins. If made according to directions it will retain all its original qualities indefinitely, and can be remelted when necessary.

    FORMULA:

    Flake Gelatin . . . . . . . 4 1/2 pounds
    Water . . . . . . . . . . . . 4 1/2 pints
    Glycerin . . . . . .. . . . . 9 pounds
    Glucose . . . . . . . . . . .1 pound
    Denatured Alcohol . . 1 ounce

    PROCESS: Place the gelatin in a large container and pour the water over same; then cover container with damp cloth to prevent evaporation. Mix up thoroughly with the hands every ten minutes to keep water evenly distributed, otherwise the bottom will absorb too much water and the top portion will dry out and harden. Replace cloth after each mixing. After gelatin is thoroughly softened, squeeze out all surplus water (if any), and place in double boiler and melt. A few minutes after it begins to melt start stirring and keep stirring until the gelatin is all melted and free from lumps. Then add the glycerin (which should have previously been heated) and stir until blended. Continue to stir until all ingredients are thoroughly incorporated and remove from fire. Now add the alcohol and stir until thoroughly blended with the rest of the mixture. The compound is now ready for use. Do not add water when remelting.

    A double boiler can easily be made by using two metal buckets or pans, one larger than the other. Put a few stones in the bottom of the larger container and partly fill with water. Then put mold compound into smaller container and place it in large container. There should be enough water in large container to come up at least half way on outside of small container. The stones are to prevent the small container from touching the bottom and thereby burning the mixture. Leave unused material in container in which it was melted.

    HOW TO GET THE ABOVE COMPOUND TO MAKE MOLDS: First select the article you desire to duplicate. Almost all articles can be duplicated, such as celluloid novelties, metal toys, dolls, etc. Articles cast in compositions, book-ends, emblems, etc.

    If the article to be cast is very simple, with one entire side flat like a book-end, emblem, or plaque, it is only necessary to lay it on some flat, smooth surface, like glass or marble, face up. Place a frame of wood or metal bars around it, having oiled the object and other parts well; then pour the pliable mold composition over it. However, for more complicated things such as door stops and novelties in forms of dogs, cats, dolls, etc., you will have to make a mold in two pieces.

    To make two piece molds, plaster should be used to reinforce the mold. To make good molds you must bear in mind that both this compound and rubber gives under the weight of the casting material. Therefore, some means must be used to hold molds made from these materials in shape. It must be made so that the mold can easily be removed from the reinforcing shell so that the mold may then be removed from the casting without damaging it.

    After you have applied the molding composition or last coat of rubber and compound starts to set - spread about 1/2 inch thickness of plaster mortar over it with a trowel, let set and then remove it. For full body molds in two parts - make one half, let it stand until set, cut notches in the plaster shell around the edge that will be spliced to the other half and then apply rubber and plaster to the other half. To prevent the plaster sticking, coat the splice edge of the first half with two coats of ordinary rubber cement.
     
  9. Nancy C

    Nancy C Well-Known Member

    That will be a lot more than $5.00 worth of materials, but it will still be interesting to know if it works.
    Give us a report if you end up trying it?