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Hello! Yes you can make an alginate mold out of a plaster object. Alginate doesn't stick to much but it would be ok to apply a really thin coat of vaseline to the plaster object in order to insure it doesn't stick. Go for it and good luck! Nathan Orosco

Beautiful!

Hi! I usually use a clay to construct fences. I roll a coil of clay t about 1inch round then compress it to a 2 x 1/2 in shape strip. I will eventually make a video of this step. I do not use metal shims (copper or aluminum as you mentioned) for silicon rubber molds. I do use metal shims to create plaster molds though, which is the more classical mold making process that is still very valuable for specific sculptures. No, for this sculpture I used water based terra cotta clay and kept it leather hard (still wet but stiff like wax), so silicon doesn't stick to anything "wet". Glad my videos are helpful! Many thanks!

No, let the clay harden to a "leather hard" state which is stiff like wax but still has a large amount of water content. I kept a plastic bag over water based clay in between working to control the drying. You can keep clay leather hard for months if you control the drying, with the occasion spray of water or leaving damp towel over it while bagged. Good luck!

You can usually treat the surface my gently smoothing/petting the clay with a plastic bag (small ziplock) pulled tight around your finger. Its a good idea to attach your forms onto a wire so it can me maneuvered without touching the clay. Temperature is also a factor with plasticine, so try to work the surface in cool environment. Good luck!

Hi! Typically I use a terra cotta (red clay) to sculpt/model. Is a regular water-based clay for pottery. Terra cotta is really smooth and good for detail. best! N.O.

Hi! I made these videos for my sculpture classes during the covid lockdown so the canvas boards are used for students as a "work board" and was given to then in their supply list. Canvas boards are good because clay does not stick to canvas, therefore students can use the canvas board to compress flat the clay slab needed for this assignment. Regular denim canvas works good. best! N.O.

Gracias!

Thank you! Glad you found it helpful. Best!

Thank you very much! I'm glad you enjoyed it!

Hello! Yes you can. In "Part 2" of this demonstration, I proceed to use water-based clay to continue to sculpt the form. th-cam.com/video/4yk7BKPZXX8/w-d-xo.html Be sure to watch Part 3 when I then use plaster to add to the surface of the form. Best!

Thanks for the info

where is part 3. Thank you . thanks for demo!@@nathanorosco-demonstration5637

Here is part 3. Best! ​@@brendapaint th-cam.com/video/lZgGlJ_7Pgw/w-d-xo.html

Hello! You can buy alginate from most art supply stores or dental supply companies. best!

Thank you! I appreciate the comment and am glad you are "catching ideas"! Hello to Scotland!

Thank you very much! Back in the day! The 90's!

You are welcome!

Thank you! Well, using water based clay has always been sculptors preference for modeling even if the artists don't want to fire the work, or doesn't have the means to. Dry clay can still last a very long time especially with adding a layer of plaster over on top and keeping the sculpture indoors. So yes, adding a layer of plaster, as demonstrated, is a way to sculpt water based clay without having to invest in a ceramic kiln. In fine art terms, this process would be called an "additive" process, meaning the artist is combining materials in such a way that realizes the form instead and adhering to a specific material process, such as ceramic fired sculpture process. best!

Hi Bonnie! Well that depends on weather you compressed the clay form to ensure that there are not air pockets on the inside. If there are air pockets then the form would crack during the firing process. You can always cut the forms in half while the clay is "leather hard" and hollow out the inside to create a 1/2 inch thick shell. You would then "score" the 2 shapes back together and poke a little hole, about 1/8 inch thick, so the are inside can escape while the clay shrinks during the firing. Thank you for the good question! Best! N

Hello! Thanks for you question. In this demonstration, it is only the muscle structure of the full mouth that is applied, not the "lips" (the part that we put lipstick on). It is important to understand that there is a muscle structure to the mouth that must be considered before the lips. If you do not apply the muscle structure first, the sculpture will typically not have the "depth" and complexity that a the face contains. Best!

@@nathanorosco-demonstration5637 why you didn't sculpt the muscle for the nose ?

@@hugger1ify Simply because the nose is not a muscle. I will be making a video demonstrating how to begin facial features (eyes, nose, lips). Best!

@@nathanorosco-demonstration5637 wow, awesome 👌 can't wait to watch your demonstration.

Hello! Yes it will if you allow it to get to "bone dry". This specific process continues in Part 3 and 4 where I demonstrate how to cover it with paster fabric to protect the clay and experience how to treat the surface of your sculpture by filing and sanding. Please view those videos. Thank you for your question! Best!

Extra thank you

@@nathanorosco-demonstration5637 Wouldn't the clay become moldy over time being trapped under the plaster? Have you noticed any signs of mold on these works?

No, not if it is kept dry. This process is more so an armature to sculpt a form that would potentially go into the mold making process. But there are many armatures/maquette that are very old in museums becuase many materials that are fragile, and are kept inside can last a good while. Best!@@gooosedog

Nice! Good work!

@@nathanorosco-demonstration5637 :D