Hey there I love your video! Just curious you said the ISO was for the air bubbles I saw you use it the second time in the sped up one but not in the first slower way through one. If you see this is there anyway you could explain how you use the ISO?
Thanks for watching it. I used it to spray the surface to break the cohesion of water that causes some surface air bubbles. It's main use to is make bubbles pop.
Hi, thank you for this detailed video! I followed this to make a plaster slab. It’s been one week of drying, the surface is a bit “powdery” to the touch.. I wonder what it means.. does it mean it isn’t set and need more time to dry, or can I simply wipe the powder off.. is it safe for me to start using it to dry wet clay without mixing some of the plaster powder in it… Thank you!!!
It's hard to say without seeing it. But if it's solid, it should be fine. A little powdery texture is a bit normal. I'd wipe it down and go for it. Unless it is crumbling. The main thing is that you don't want chunks of plaster in your clay. Sorry I can't be more helpful!
This was a great tutorial! Unfortunately, I dropped my mold out too quickly and it cracked, is there any way to fix this without redoing the whole process?
Thanks for watching! Unfortunately plaster is a chemical reaction.. so it can't be undone, and I'm not sure of any way to connect pieces together. Sorry that happened!
Hi and thank you for the helpful tips!! How did you decide to use 10lbs of plaster? I followed the mathematical instructions of a different video because I wasn't sure where to start with how much water/plaster to use for my specific container and it turned out HUGE. I wasted a ton of plaster and am hoping to try again. Without being able to rely on experience, how can someone figure out how much plaster they should use, given the dimensions of their container? Thanks again!
Thanks for watching! The plaster came in a bag of 10 lbs, and the ratio calculator said it worked out for the pan size. Here's a link to a plaster volume calculator if you're using a different mold or pan plaster.glazy.org/
Thank you. I think It’s important that the tray / container you are using should having sloping sides. If you use a container with straight sides, it may be very difficult to persuade the plaster cast to emerge because the mixture expands as it sets. I once tried to make a plaster batt in a round cake tin with one of those push-up bottoms. Perfect I thought, I can push the mould out when it’s set. But no, the expanded plaster was completely wedged into the tin. End of cake tin.
That's a good point to take into consideration. The pan I used here did not have any trouble releasing the mold. I do think this pan has a very slight slope as well. Good to know, thank you for sharing!
Very good video ! Can you tell me where you got the table that you are using for your video. Are you using saw horses and piece of wood ? It seems nice and solid ! I am starting to work with clay and need to get myself a small inexpensive work table.
I got it from Costco! They usually have them in stock around the spring time. It's a pretty decent work table. There are definitely sturdier options out there, but it would be a lie to say I don't use it all the time. It collapses into a nice little flat bit with a handle and it's lightweight. It was originally my husband's for woodworking and I adopted it when he upgraded.
Hey Melissa, great question! There are a lot of different types of plasters. Let's go with plaster of Paris from a hardware store vs the Pottery Plaster #1 I'm using. The Pottery Plaster #1 is made from a higher quality gypsum, and forms a harder mold that is stronger and more suitable for heavy use.
I started wedging on mine almost immediately. I'd say it takes 2-3 days for it to be completely dry. The drier it is, the better it will be at absorbing moisture, but it works well enough pretty much immediately after it's set. Give it a nice wipe first to get any loose plaster bits so they don't go into your clay.
well mine is out of the mold a few days ago and looks great but it is taking forever to dry completely. How long does it normally take for one of these things to dry out enough to put it in use?
The plaster used is Pottery Plaster No. 1, which is specifically designed to be used in ceramics. It's made to be used for both wedging surfaces and casting molds. If any minute amount of plaster gets on your work, you can just wipe it off the bottom. In my experience, there isn't really any "dust" to speak of after the plaster is set.
There are a lot of different kinds of plaster, so its hard to answer with certainty... I can tell you that pottery plaster is stronger and harder than plaster of Paris. SO if you use plaster of Paris, you would have to be extra careful not to break off any tiny bits into your clay. The main point of the plaster is that, in general, plaster is porous and absorbent. I would say your best bet is to try out what is available to you, and see how it behaves. If it's absorbing well, and it isn't leaving pieces in your clay, it's probably fine to use. You might have to do some testing, and you may end up just needing to be a little more careful with your plaster slab. Thanks for watching, I hope you find a solution. If you want to comment again with your findings after testing, it might be helpful for others here. 😊
안녕 Andrea, I had the same problem in Germany and found out that I had to search for calcium sulfate plaster or alpha gypsum- normal plaster is beta gypsum- I ended up finding it by searching for "plaster for slip moulds" or supraduro plaster, maybe you can find a local potter in Korea who makes moulds for slipcasting, they will be using this plaster and maybe can help you buy it? All the best x
I think i’ve seen people just add a layer on canvas to the top of the plaster to avoid any chucks getting into your clay. The plaster still works (any kind really) to pull out the moisture, even through a layer of canvas. Great video I can’t wait to try this!
I like the cake pan idea, I need to do this. Thank you for the video.
You are so welcome, thanks for watching 😊
Hey there I love your video! Just curious you said the ISO was for the air bubbles I saw you use it the second time in the sped up one but not in the first slower way through one. If you see this is there anyway you could explain how you use the ISO?
Thanks for watching it. I used it to spray the surface to break the cohesion of water that causes some surface air bubbles. It's main use to is make bubbles pop.
Thank you for your very clear instructions.
You are so welcome! I'm glad to be a help 😊
Hi. Your videos are awesome for a newbie trying to setup a small pottery studio. What are you turning your mood on to?
I've been jamming a Spotify custom hip-hop playlist here recently 🎧
Thanks for your reply. Didn’t check autocorrect or typo…I meant to ask what are turning your plaster mold unto? Is it a tile?
It's just a slab of plaster. I use it to wedge and reclaim clay. :)
nice, this is exactly what I'm going to do .....we have a plan!👍
You can do it!
This was very helpful! Thank you so much.
Glad it was helpful! Thank you for watching ☺️
Hi, thank you for this detailed video! I followed this to make a plaster slab. It’s been one week of drying, the surface is a bit “powdery” to the touch.. I wonder what it means.. does it mean it isn’t set and need more time to dry, or can I simply wipe the powder off.. is it safe for me to start using it to dry wet clay without mixing some of the plaster powder in it…
Thank you!!!
It's hard to say without seeing it. But if it's solid, it should be fine. A little powdery texture is a bit normal. I'd wipe it down and go for it. Unless it is crumbling. The main thing is that you don't want chunks of plaster in your clay. Sorry I can't be more helpful!
Great video!
Thank you!!!!!! ☺️
This was a great tutorial! Unfortunately, I dropped my mold out too quickly and it cracked, is there any way to fix this without redoing the whole process?
Thanks for watching! Unfortunately plaster is a chemical reaction.. so it can't be undone, and I'm not sure of any way to connect pieces together. Sorry that happened!
Hi and thank you for the helpful tips!! How did you decide to use 10lbs of plaster? I followed the mathematical instructions of a different video because I wasn't sure where to start with how much water/plaster to use for my specific container and it turned out HUGE. I wasted a ton of plaster and am hoping to try again. Without being able to rely on experience, how can someone figure out how much plaster they should use, given the dimensions of their container? Thanks again!
Thanks for watching! The plaster came in a bag of 10 lbs, and the ratio calculator said it worked out for the pan size. Here's a link to a plaster volume calculator if you're using a different mold or pan plaster.glazy.org/
Thanks a ton for responding!
Thank you. I think It’s important that the tray / container you are using should having sloping sides. If you use a container with straight sides, it may be very difficult to persuade the plaster cast to emerge because the mixture expands as it sets. I once tried to make a plaster batt in a round cake tin with one of those push-up bottoms. Perfect I thought, I can push the mould out when it’s set. But no, the expanded plaster was completely wedged into the tin. End of cake tin.
That's a good point to take into consideration. The pan I used here did not have any trouble releasing the mold. I do think this pan has a very slight slope as well. Good to know, thank you for sharing!
I like the star bucks apron
Thanks!
Very good video ! Can you tell me where you got the table that you are using for
your video. Are you using saw horses and piece of wood ? It seems nice and solid ! I am starting to
work with clay and need to get myself a small inexpensive work table.
I got it from Costco! They usually have them in stock around the spring time. It's a pretty decent work table. There are definitely sturdier options out there, but it would be a lie to say I don't use it all the time. It collapses into a nice little flat bit with a handle and it's lightweight. It was originally my husband's for woodworking and I adopted it when he upgraded.
Will plaster of paris work?
There are people who have used it, but it's a much weaker form of plaster. Pottery plaster would be preferable.
@@BlueNoseTrading thanks for sharing
what's the difference between this plaster and the standard plaster you find in a carton at the hardware store or craft store?
Hey Melissa, great question! There are a lot of different types of plasters. Let's go with plaster of Paris from a hardware store vs the Pottery Plaster #1 I'm using. The Pottery Plaster #1 is made from a higher quality gypsum, and forms a harder mold that is stronger and more suitable for heavy use.
did you use a release agent for the pan??
No, I didn't use anything except a pan with plaster straight into it. Thanks for watching :)
How long after it dries until you can start to use the slab?
I started wedging on mine almost immediately. I'd say it takes 2-3 days for it to be completely dry. The drier it is, the better it will be at absorbing moisture, but it works well enough pretty much immediately after it's set. Give it a nice wipe first to get any loose plaster bits so they don't go into your clay.
can i put wrap in the mold for ease of removal?
I don't see why not. I'm not sure if it will or won't make it easier, so let me know if it helps!
well mine is out of the mold a few days ago and looks great but it is taking forever to dry completely. How long does it normally take for one of these things to dry out enough to put it in use?
It really just depends on the ambient temperature and humidity where you live
@@BlueNoseTrading I put fan on it got it dried out and fixing to throw my second batch of clay on it now ....we cooking with gas now baby!!!!
Wont the plaster dust stick on the clay?
The plaster used is Pottery Plaster No. 1, which is specifically designed to be used in ceramics. It's made to be used for both wedging surfaces and casting molds. If any minute amount of plaster gets on your work, you can just wipe it off the bottom. In my experience, there isn't really any "dust" to speak of after the plaster is set.
just poured mine waiting on it to dry 18L x 26W x H2, four gallons of plaster
Awesome! I hope it serves you well.
@@BlueNoseTrading well I hope so but its not out of the mold yet and I do have a bunch of clay that needs to be dried out and used
hi! is it ok to use normal plaster? There's no pottery plaster in my country
There are a lot of different kinds of plaster, so its hard to answer with certainty... I can tell you that pottery plaster is stronger and harder than plaster of Paris. SO if you use plaster of Paris, you would have to be extra careful not to break off any tiny bits into your clay.
The main point of the plaster is that, in general, plaster is porous and absorbent. I would say your best bet is to try out what is available to you, and see how it behaves. If it's absorbing well, and it isn't leaving pieces in your clay, it's probably fine to use. You might have to do some testing, and you may end up just needing to be a little more careful with your plaster slab.
Thanks for watching, I hope you find a solution. If you want to comment again with your findings after testing, it might be helpful for others here. 😊
안녕 Andrea, I had the same problem in Germany and found out that I had to search for calcium sulfate plaster or alpha gypsum- normal plaster is beta gypsum- I ended up finding it by searching for "plaster for slip moulds" or supraduro plaster, maybe you can find a local potter in Korea who makes moulds for slipcasting, they will be using this plaster and maybe can help you buy it? All the best x
I think i’ve seen people just add a layer on canvas to the top of the plaster to avoid any chucks getting into your clay. The plaster still works (any kind really) to pull out the moisture, even through a layer of canvas. Great video I can’t wait to try this!
How did you calculate water to plaster ratio??
I calculated the plaster ratio using this chart from aardvark clay :)
www.aardvarkclay.com/pdf/technical/Plastermixinginstructions.pdf
I tried ... so far epic fail.
The second time I tried, I messed it up really bad. I think my plaster was too old. The age of the plater matters I think.