Thank you Paul! I am glad I saw this before I went ahead with a plaster project, or else I would have been kicking myself with the things I would never have thought of doing.
Hi, this is a very helpful video. Just wondering how does Crystacal compare to other general purpose plasters? Is it chemically stronger than casting plasters that you can get in art shops etc? Thanks
My paster has been hardening but it's not getting warm when it cures.What is the problem just bought it using the right ratio could it be the temperature of the water or the cold weather?
What type of clay did you use? It seems there are more then one type. Some can be used after air drying, some can be fired in an oven and some need a kiln. Will any type work for the mold and how long do you let it set before pouring in the mix? Would a fine grout cement work as well? I'd like to make something that can be set outside and plaster would not survive a light rain.
Did you use cold, warm, luke warm, or hot water? I have been trying to make a wedging table but the plaster keeps getting hot and then hardens really fast but I was also using a drill bit to mix it and reading the back of the bag that didn't work. thanks!
Any kind of clay will do, It is simply an impression in the clay filled with standard casting plaster. Clay and plaster will always separate easily but impression molds can be made with many other materials such as sand ,wax even garden soil! Experiment and have fun.
It is also good if the plaster is liquid. There will be less bubbles and better penetration into the details. I use liquid plaster all the time. Ratio 1:1.
When mixing the plaster with the water prepare two bowls one with the water and one with plaster pour the 50 % plaster in the water in one go into the 50% water bowl. Sifting action. Wait for the plaster to saturate with the water. Do not wait too long mix from top of the plaster heap in a circle action until you reach the bottom of the bowl keep on stirring until the mix reach a tin to medium porridge consistency . Pour from the side of the mould.
Thats how I do it andre muller. I a dental tech. It last 2Xs as long if you let the water soak up the water. I do however pour 1/2 of the water into the bowl first the plaster and let it soak up then add the water to make the mis as thick or as thin as I need for whatever pour I am doing or troweling.
what i do is to put en small plastic bags all the plaster and keep it in a cardboard box , this avoids the moisture, i bought like 4 bags of plaster about a year or two and keep using it
Cold water if you want a slow set..you could even chill the water first. hot water accelerates the setting. The heat is the latent heat of crystallization! Plaster always heats up as it sets and re-crystallizes..Be careful it can get very hot!
I see a couple of problems 1. Mix your plaster as follow a. 50% water 50% plaster. b. First Pour the 50% water in a bowl. c. Pour your plaster in the water not paster then water. d. Leave the plaster to saturate with the water ( like sand under the water in a riverbed - before mixing. e. start mixing the plaster slowly from top to bottom. Use a upside down spoon d. keep on mixing the plaster until a thin to medium porridge constant. - mix must not be watery. 2. Before pouring the mixed plaster sif a fine talcum powder onto print mold. Do not worry if to much talcum - Plaster is more heavy and will push excess talcum powder away. After pouring the plaster leave it to dry completely. Depending on the weather - 2 to 3 hours or overnight. This method will result in a white base. Crime Print expert South Africa
The best is the ratio 1:1,But it also depends on the type of plaster . If water remains on the surface of the plaster after 15 minutes, simply pour it off. Only quick-drying plaster is good for casting. Any modelling plaster is useless. I've really tried a lot.
great video thanks. i have mixed crystakal.r plaster for years and used my hands and it never burned me ones. your not going to put your hands in a tub of wet plaster until it sets. obvious as this would burn and you would need a good friend you think you can trust to beet the shit out of the hard plaster with a jackhammer and miss your hands. the correct mix ratio for crystacal.r is 35.grams water to 100.grams plaster. you can use a small dentist unit witch is a small vibrating table used for making plaster teeth they are not expensive it is a good idea to use an electric mixing paddle attached to a drill as faster mixing will make sure you mix all the plasters crystals giving you the perfect plaster mix. i am a professional caster and have used many plasters cements resins and rubbers. and you can make expensive materials work cheaper for you using the exposed material on the facing with the expensive material and hiding the cheaper material inside the casting, example make a hollow shell and fill it in with cheaper as this will not be seen.
Hi Paul - you said in your video the plaster costs around £8. I can't find it for that price in UK. Only for about £40. Please help as I'm making plaster moulds and need some crystacal. Thanks in-advance, Justin
many thanks, ps I meant crystacal your plaster is cheaper, sorry for confusion, thanks for reply. And who ordered this inflation anyway, not me - I won't my money back lol
Have you ever actually used plaster? Mixing it with your hands is pretty much the standard thing to do, and I have never heard of anyone getting burned.
1. Fellow down below Andre Muller is only partially right, and left some crucial details out. Like for example he doesn't even explain that some types of plaster sets differently than others. 2. The guy in video says brushing in the plaster will damage the clay. Perhaps he should take a few classes on mask making. We brush on gypsum all the time onto clay sculptures for making masks. We never damage our clay, even water based clay. If you wait and let it get a little 'leathery' it's much better. Also we spray acrylic aerosol paint onto our sculpture to create a very thin plasticy coating, matte so it's not so slick. I never have a problem with my plaster picking up brush strokes etc. but than again I've done it many times now and know how to do it this way.
What about covering the the thing you were making a mold of with say Plastic wrap or something say stetched tightly over it then put the pour the plaster over it, then take out the clay piece by pulling out and up with the plastic wrap leaving the mold behind?
That would work but you may loose some detail. Also the whole idea with this process is that you can cast directly from a clay impression waste mould. This is just one of very many casting techniques I usually use to introduce students to the basics of mould making. Thanks for you comment.
Always wear protective clothing, goggles and a mask when using plaster. Never let setting plaster set on any part of your body as indeed it heats up and can burn. Thanks for your F****** comment.
When a bag of plaster is opened it starts to absorb moisture from the air and slowly goes off! After a few months it is usually no good..The plaster in this video is fine strong plaster for sculpture, not the stuff you do walls with!
I've just bought a 10kG bucket of this and the warnings on it plainly say how will burn your skin when drying. I was cringing watching it all over her hands. Wear gloves!
i have an experiance about 14 years in plastering and i have a different way to do a gypsum mold by using gypsum,it's not easy,you look like you canst on a molding
Thank you Paul! I am glad I saw this before I went ahead with a plaster project, or else I would have been kicking myself with the things I would never have thought of doing.
Hi, this is a very helpful video. Just wondering how does Crystacal compare to other general purpose plasters? Is it chemically stronger than casting plasters that you can get in art shops etc? Thanks
So good. Thank you for the level of detail and advice. I can pass this on to so many interns and students ansd friends and, and, and... ❤️
Great Video! Just the information I needed :)
My paster has been hardening but it's not getting warm when it cures.What is the problem just bought it using the right ratio could it be the temperature of the water or the cold weather?
What type of clay did you use? It seems there are more then one type. Some can be used after air drying, some can be fired in an oven and some need a kiln. Will any type work for the mold and how long do you let it set before pouring in the mix? Would a fine grout cement work as well? I'd like to make something that can be set outside and plaster would not survive a light rain.
Great video. How do I pour multiple pigment colored plaster into the mold? Thanks
Measure
MEASURE Everything!
Consistency is the key.
The brown colour on the plaster cast is just the residue of the clay that was used to make mould.
Hi Paul, thanks for the video, does the residue wash off, any way to block this leeching? Thanks
Could someone tell me what's the difference between perfect cast and perfect plaster? I'm using perfect cast at the moment.
clay printing is a really quick way to get some nice 3d embossments.
very good tips. thanks
Did you use cold, warm, luke warm, or hot water? I have been trying to make a wedging table but the plaster keeps getting hot and then hardens really fast but I was also using a drill bit to mix it and reading the back of the bag that didn't work. thanks!
Any kind of clay will do, It is simply an impression in the clay filled with standard casting plaster. Clay and plaster will always separate easily but impression molds can be made with many other materials such as sand ,wax even garden soil! Experiment and have fun.
When is a bag of plaster too old to use? When it dries I get little sandy bits when I carve it.
Hello. I want to know. from where. Got a silicon accustom know ration price. In any country. Existing.
Thank you for then information.
what is plaster ? could you describe it or what it is or what point of THIS PLASTER ?
if I don't want the consistency to liquid do I just add more plaster
thanks
It is also good if the plaster is liquid. There will be less bubbles and better penetration into the details. I use liquid plaster all the time. Ratio 1:1.
When mixing the plaster with the water
prepare two bowls
one with the water and one with plaster
pour the 50 % plaster in the water in one go into the 50% water bowl. Sifting action.
Wait for the plaster to saturate with the water.
Do not wait too long
mix from top of the plaster heap in a circle action until you reach the bottom of the bowl
keep on stirring until the mix reach a tin to medium porridge consistency .
Pour from the side of the mould.
Thats how I do it andre muller. I a dental tech. It last 2Xs as long if you let the water soak up the water. I do however pour 1/2 of the water into the bowl first the plaster and let it soak up then add the water to make the mis as thick or as thin as I need for whatever pour I am doing or troweling.
what i do is to put en small plastic bags all the plaster and keep it in a cardboard box , this avoids the moisture, i bought like 4 bags of plaster about a year or two and keep using it
Cold water if you want a slow set..you could even chill the water first. hot water accelerates the setting. The heat is the latent heat of crystallization! Plaster always heats up as it sets and re-crystallizes..Be careful it can get very hot!
I see a couple of problems
1. Mix your plaster as follow
a. 50% water 50% plaster.
b. First Pour the 50% water in a bowl.
c. Pour your plaster in the water not paster then water.
d. Leave the plaster to saturate with the water ( like sand under the water in a riverbed - before mixing.
e. start mixing the plaster slowly from top to bottom. Use a upside down spoon
d. keep on mixing the plaster until a thin to medium porridge constant. - mix must not be watery.
2. Before pouring the mixed plaster sif a fine talcum powder onto print mold.
Do not worry if to much talcum - Plaster is more heavy and will push excess talcum powder away.
After pouring the plaster leave it to dry completely.
Depending on the weather - 2 to 3 hours or overnight.
This method will result in a white base.
Crime Print expert South Africa
Is there a way to make gypsum mushy as long as possible and thank you for the explanation
ahmed maileb Ad one cup of milk will give you about 3 hours of soft plaster mix
@@ahmedmaileb7229 To prolong the work with plaster -
citric acid is commonly used.The classic powder that is used for preserving fruit .
Did you just use normal plaster of paris or anything more added to it?
Can you tell the proportion of plaster and water?
The best is the ratio 1:1,But it also depends on the type of plaster .
If water remains on the surface of the plaster after 15 minutes, simply pour it off.
Only quick-drying plaster is good for casting. Any modelling plaster is useless. I've really tried a lot.
great video thanks. i have mixed crystakal.r plaster for years and used my hands and it never burned me ones. your not going to put your hands in a tub of wet plaster until it sets. obvious as this would burn and you would need a good friend you think you can trust to beet the shit out of the hard plaster with a jackhammer and miss your hands. the correct mix ratio for crystacal.r is 35.grams water to 100.grams plaster. you can use a small dentist unit witch is a small vibrating table used for making plaster teeth they are not expensive it is a good idea to use an electric mixing paddle attached to a drill as faster mixing will make sure you mix all the plasters crystals giving you the perfect plaster mix. i am a professional caster and have used many plasters cements resins and rubbers. and you can make expensive materials work cheaper for you using the exposed material on the facing with the expensive material and hiding the cheaper material inside the casting, example make a hollow shell and fill it in with cheaper as this will not be seen.
Any chance of picking your brains??
Hi Paul - you said in your video the plaster costs around £8. I can't find it for that price in UK. Only for about £40.
Please help as I'm making plaster moulds and need some crystacal. Thanks in-advance, Justin
Hi Justin, I posted this video 8 years ago! Inflation! Try Alec tiranti's for a similar hard plaster.
many thanks, ps I meant crystacal your plaster is cheaper, sorry for confusion, thanks for reply. And who ordered this inflation anyway, not me - I won't my money back lol
justin james
Have you ever actually used plaster? Mixing it with your hands is pretty much the standard thing to do, and I have never heard of anyone getting burned.
1. Fellow down below Andre Muller is only partially right, and left some crucial details out. Like for example he doesn't even explain that some types of plaster sets differently than others.
2. The guy in video says brushing in the plaster will damage the clay. Perhaps he should take a few classes on mask making. We brush on gypsum all the time onto clay sculptures for making masks. We never damage our clay, even water based clay. If you wait and let it get a little 'leathery' it's much better. Also we spray acrylic aerosol paint onto our sculpture to create a very thin plasticy coating, matte so it's not so slick. I never have a problem with my plaster picking up brush strokes etc. but than again I've done it many times now and know how to do it this way.
What about covering the the thing you were making a mold of with say Plastic wrap or something say stetched tightly over it then put the pour the plaster over it, then take out the clay piece by pulling out and up with the plastic wrap leaving the mold behind?
That would work but you may loose some detail.
Also the whole idea with this process is that you can cast directly from a clay impression waste mould. This is just one of very many casting techniques I usually use to introduce students to the basics of mould making. Thanks for you comment.
Is the ratio about 2 to 1 plaster to water?
Excellent proportion is: 6 parts water + 10 parts gypsum!!!! For strength, you can add 2 tablespoons of PVA glue.
Always wear protective clothing, goggles and a mask when using plaster. Never let setting plaster set on any part of your body as indeed it heats up and can burn. Thanks for your F****** comment.
LOL get burnt by plaster?
It's more dangerous to put your hands in cement because of the high alkalinity.
Josh Mason. I had cement burn a few years ago. The best treatment is to knead linseed oil putty. Very soothing.
When a bag of plaster is opened it starts to absorb moisture from the air and slowly goes off!
After a few months it is usually no good..The plaster in this video is fine strong plaster for sculpture, not the stuff you do walls with!
HI PAUL. when or if your plaster goes of. i mix mine with resin to make castings. so it does not go to waist.
TOTAL AMATEUR !!!
Search Plaster of Paris
U didn’t water proof it ...
POR FABOR¡ EN CASTELLANO!! ESPAÑOL ESCRIBAN LOS VIDEOS
what do I do with my hands? Ricky Bobby
+chucksT Shake - n - Bake!
That just happened...
I've just bought a 10kG bucket of this and the warnings on it plainly say how will burn your skin when drying. I was cringing watching it all over her hands. Wear gloves!
i have an experiance about 14 years in plastering and i have a different way to do a gypsum mold by using gypsum,it's not easy,you look like you canst on a molding
mahmoud zich κθ,;σαρα σαουνντρες
sara saundres
english please
Why aren’t you measuring the quantites of water and plaster? This sounds very unscientific....