how can I make concrete molds ?
xcaret
20 years ago
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xcaret
20 years agobodiCA
20 years agoRelated Discussions
How do I make a alligator mold?
Comments (8)Here's how I would do it: Create your alligator out of paper, or if possible, a more impermeable material, like plastic from plastic bags (I don't know what technique you're using, which is why this would seem to be a feasible approach). The created alligator would be your 'positive image'. Create your mold out of latex rubber or whatever substance you plan on using. The mould will be your 'negative image'. You will create it by applying a release agent to your paper (or plastic) alligator, then applying layers of latex to completely cover your alligator. When dry, cut around the half of the alligator, making an upper and a lower half. Remove your two negative images (half moulds). Find some kind of support for your molds, such as a filled sandbox. Remember, your molds are flexible and will get distorted unless you surround the outter parts with something to prevent them from moving around when you apply the tufa. Apply your tufa to each half. You don't necessaryly have to fill the alligator, just apply to the borders if your alligator is too big. Remember to try to be accurate at the borders as you will be joining them when they are partially cured (after 24-48 hours) Join the two halves using more tufa to 'glue' them together The rest is observation, waiting for the right moment to scrape with your wire brush etc. Also, I'm assuming there will be no overhangs, such as an open mouth or anything like that, which would make your mold a bit more intricate. Hope this helps...See MoreMaking a mold from gritty concrete original - Help!
Comments (4)We use a wide variety of commercial releases but for old concrete you can try this homebrew combination. First, seal the surface if possible. It will keep anything from penetrating and forming a bond. The best choice depends on the nature of the piece and whether or not it must remain "as is". If yes, then seal with something that will be removeable and will not permenently affect the surface. Painting on liquid soap or a light wax for example. These can always be removed later with water or alcohol. If not, then a more aggresive release like oil, Pam, Shellac, etc. (these penetrate concrete and will be there for a long time as well as altering the appearance of the original). Once you have applied a sealant, one of the best releases for POP is a very fine coating of a dry powder...baby powder works great. Dust it all over while the sealant is damp or tacky and it will form a lightly bonded layer that very little will ever stick to. It also leaves the POP mold clean on the inside, where oil alone can impart and leave a layer inside the mold that never quite sets properly and may lose a lot of detail by coming off when the original is removed. Take a look at the Reynold Advanced Materials page on the link below. They have a lot of different releases for different situations and are great people to go to for advice. They are really knowledgable and helpful. Even put on hands on" seminars at their locations. Hope this helps, best of luck and let us know how it turns out. Here is a link that might be useful: Molding & Casting Supplies & Info......See MorePre-made face mold, how do I make a planter? See pic!
Comments (1)There would be two methods I can think of: 1. Build a mold for a planter with a hole cut for the face mold and attach the face mold to it; so it all in essence becomes one mold 2. Cast the face separately but embed wires into it while still wet once it sets you can pour your container (or hand build as the case may be) and push the face down into it with the wires going in first. I have done this when attaching separately made hands or a head with my sculptures. Not sure how well it would work for you though....See Morehow do I make a 1/2 inch hole in a concrete retaining wall?
Comments (2)You can purchase a rotary hammer (the heavier duty version of a hammer drill) for around $180. A hammer drill is less than $100. A hammer drill is more likely to be useful for other work, since the hammer can be turned off (not possible with all rotary hammers)....See MorebodiCA
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