I wasn't prepared for that Star Trek reference, I almost choked on my cereal xD. But thank you so much for this video, it was very helpful! Earned a sub right away.
If you are concerned about the second layer of rubber disturbing the first you could place a stirring stick on top of the mould and pour onto that. This means that the drop to the surface is only a short distance.
Any suggestions on how to make something bigger? I want to make a solid hemisphere, 8" diameter, able to hold about 200lbs. Any ideas? Concrete was too crumbly after lots of use, but otherwise not too bad.
Hey there man, Appreciate you posting this up. I presume you can do the reverse here with no problems (i.e. urethane rubber mould and cast silicone, etc). I just asked a general question about it on a forum and someone there is saying the silicone would suffer cure inhibition if casting it in a urethane rubber... can you weigh in? If you're casting urethane in silicone, surely you can cast silicone in urethan rubber, aye? Thanks for posting!
I've never heard of urethane causing cure inhibition in silicone, but that doesn't mean it's impossible. I'd suggest you use mold release and try it out ¯\_(ツ)_/¯ thanks for the kind words
Hey dude, thanks for this video. I'm trying to make my own skateboard wheels. Do you have any tips? I'd like to make hard wheels that will slide well.. how can I find rubber with harder durometers?.. Thanks!... Also.. how do you cure the rubber?
the rubber cures when it solidifies automatically, that's the curing process. As for the other questions, someone who knows more about urethane rubber should answer those. maybe try calling a supplier like silpak in north hollywood
Seriously, thank you for making this video. I've been unsure about whether you can actually cast urethane rubber in silicone molds or if the mold has to be solid, so thank you! On the other hand, there really is no reason to use a flexible mold material such as silicone when casting urethane, correct? Since the urethane is flexible in itself. Do you think I could get good results pouring the urethane into a plaster mold? Again, thank you!
Super-duper late necro posting here, but I'm pretty sure the mould being softer or more flexible than the casting resin is a great help if the piece has intricate detail that might suffer stress if you try to remove it from a harder material... I mean, If you are using something with 90 A shore hardness it doesn't mean you are going to subject it to the full stress It can withstand right away if you don't really need to, right?
I was wondering if you can help me. So I need urethane make sure to make my Spider-Man webs for my suit. I’ll be putting my urethane into a mold but im not sure which urethane would be the best. What’s prob a good mixture to make flexible webs from a mold and to be glued onto a suit. Any extra information is appreciated
I need to mold rubber polyurethane, not liquid. So I will be heating up the polyurethane and pouring it in a mold. Will the silicone hold the heated polyurethane?! Do you know what the heating temperature is before the mold is ruined or what types of mold I should use?
The silicone should be able to handle the heat with no issues. I've used them to pour melted thermo plastics before with no issues. Silicone is used for baking pans as well. I believe it's food safe for anything up to about 400-450F.
I'm struggling with a poly project...or is it a silicone project? I want to make my own thin poly sheets that are just flexible enough to be re-heated later, supplemented with more poly, etc. Same stuff they use in thin skin hair pieces...but don't know the formula. Trying to make skins for cosplay, removable / realistic tattoos, and pieces with realistic hair imbeds like they do on movie sets. Any suggestions? Thanks Kai!!!!
Hi, can you please tell us which release agent you used? Is it the same you use to avoid silicone rubber moulds to stick to the bottom and sides of the mould container (box in which you made the mould)?
Looking to make a rubber tip on a float valve in an old obsolete equipment carburetor. it is a small part but it needs to be gas and oil resistant, do you have any suggestions on molding a Butyl rubber compound?
I'm looking at this right now. You can buy this stuff with hardness ratings from as high as 90A down to about 25A. Lower the number the softer it is. They are all going to be flexible if thin enough. 50 and lower is pretty soft and spongy.
how flexible is this rubber? I am made a lot of molds and poured resin, but never rubber. Was wanting to make a more flexible/durable action figure than what resin offers
Hi! The rubber I used in this video has a hardness of 90A, which makes it similar to a shopping cart wheel, so not extremely flexible. If you really want flexibility you can use a rubber with a lower hardness rating. In terms of pouring, this rubber poured fine, and I've used it in more complicated molds with varied success. It will probably take you a few tries to get it just right. Smooth-on provides the hardness and viscosity ratings on the product page, including charts to help you find just the right material for you.
Planning on making urethane body pieces for cosplay...does this method work depending on the firmness of the urethane? Cure times? Demold times? do you recommedn slush casting?...so many questions :)
I haven't done a lot of cosplay, but with a good plan I'm sure this method could work for you. If I were going to do something similar I would sculpt the body pieces in clay (or whatever you like to sculpt with) and take a mold of it, then pour the urethane in the mold. Slush casting would be fine. There are also lot's of materials you can sculpt with that will become the actual piece, no molding or casting needed. Google "worbla" as an example.
Yeah you usually can, the important thing is to use a mold release coating. Anywhere that silicone touches bare silicone they will bond together (I think urethane is the same but I don't know for a fact)
Hey dude u look perfect for the robotic humanoid project I'm working on. Like ur enjoyment toward getting dirty into all the tuff stuff. Would u be up for discussion, do u have contact info? Either way loved the vid dude, that was great!!
Sure you could, you'll just need a mold. You can sculpt the mask and take a mold of it, or buy something suitable as a mold like a mask from the hobby store.
Certainly, with the right exposure. In this project I was using such a small amount and with ventilation moving the air away from my face so I accepted the risk, if I had caught a whiff of the rubber I would've put my mask on. My standards don't need to be everyone else's, even I'll admit I screw up sometimes (in at least one other vid you can see I'm not wearing a dust mask when I really should've been). Always check your material safety data sheets and choose to protect yourself
I wasn't prepared for that Star Trek reference, I almost choked on my cereal xD. But thank you so much for this video, it was very helpful! Earned a sub right away.
If you are concerned about the second layer of rubber disturbing the first you could place a stirring stick on top of the mould and pour onto that. This means that the drop to the surface is only a short distance.
Any suggestions on how to make something bigger? I want to make a solid hemisphere, 8" diameter, able to hold about 200lbs. Any ideas? Concrete was too crumbly after lots of use, but otherwise not too bad.
Hey there man,
Appreciate you posting this up. I presume you can do the reverse here with no problems (i.e. urethane rubber mould and cast silicone, etc). I just asked a general question about it on a forum and someone there is saying the silicone would suffer cure inhibition if casting it in a urethane rubber... can you weigh in? If you're casting urethane in silicone, surely you can cast silicone in urethan rubber, aye? Thanks for posting!
I've never heard of urethane causing cure inhibition in silicone, but that doesn't mean it's impossible. I'd suggest you use mold release and try it out ¯\_(ツ)_/¯ thanks for the kind words
how much does urethane rubber differentiate when it comes to casting ?
Hey dude, thanks for this video. I'm trying to make my own skateboard wheels. Do you have any tips? I'd like to make hard wheels that will slide well.. how can I find rubber with harder durometers?.. Thanks!...
Also.. how do you cure the rubber?
the rubber cures when it solidifies automatically, that's the curing process. As for the other questions, someone who knows more about urethane rubber should answer those. maybe try calling a supplier like silpak in north hollywood
Great video! is there any paint that sticks well with urethane? wanted to paint over after the cure.
Thank you, I usually just color the rubber itself, but Smooth On has a good article on painting urethane on their website you should check that out
Thanks!
Seriously, thank you for making this video. I've been unsure about whether you can actually cast urethane rubber in silicone molds or if the mold has to be solid, so thank you! On the other hand, there really is no reason to use a flexible mold material such as silicone when casting urethane, correct? Since the urethane is flexible in itself. Do you think I could get good results pouring the urethane into a plaster mold? Again, thank you!
Super-duper late necro posting here, but I'm pretty sure the mould being softer or more flexible than the casting resin is a great help if the piece has intricate detail that might suffer stress if you try to remove it from a harder material... I mean, If you are using something with 90 A shore hardness it doesn't mean you are going to subject it to the full stress It can withstand right away if you don't really need to, right?
I was wondering if you can help me. So I need urethane make sure to make my Spider-Man webs for my suit. I’ll be putting my urethane into a mold but im not sure which urethane would be the best. What’s prob a good mixture to make flexible webs from a mold and to be glued onto a suit. Any extra information is appreciated
I need to mold rubber polyurethane, not liquid. So I will be heating up the polyurethane and pouring it in a mold. Will the silicone hold the heated polyurethane?! Do you know what the heating temperature is before the mold is ruined or what types of mold I should use?
The silicone should be able to handle the heat with no issues. I've used them to pour melted thermo plastics before with no issues. Silicone is used for baking pans as well. I believe it's food safe for anything up to about 400-450F.
I'm struggling with a poly project...or is it a silicone project? I want to make my own thin poly sheets that are just flexible enough to be re-heated later, supplemented with more poly, etc. Same stuff they use in thin skin hair pieces...but don't know the formula. Trying to make skins for cosplay, removable / realistic tattoos, and pieces with realistic hair imbeds like they do on movie sets. Any suggestions? Thanks Kai!!!!
"Drug Dealer AF" warning LOL..dude..i call my scale my drug scale all the time in my FB live videos LOL...so glad i am not the only one!
Hi, can you please tell us which release agent you used? Is it the same you use to avoid silicone rubber moulds to stick to the bottom and sides of the mould container (box in which you made the mould)?
Is the urethane flexible or completely rigid?
Looking to make a rubber tip on a float valve in an old obsolete equipment carburetor. it is a small part but it needs to be gas and oil resistant, do you have any suggestions on molding a Butyl rubber compound?
Is it flexible like rubber?
I'm looking at this right now. You can buy this stuff with hardness ratings from as high as 90A down to about 25A. Lower the number the softer it is. They are all going to be flexible if thin enough. 50 and lower is pretty soft and spongy.
how flexible is this rubber? I am made a lot of molds and poured resin, but never rubber. Was wanting to make a more flexible/durable action figure than what resin offers
also how viscous is it? would it pour easily into a two piece action figure mold?
Hi! The rubber I used in this video has a hardness of 90A, which makes it similar to a shopping cart wheel, so not extremely flexible. If you really want flexibility you can use a rubber with a lower hardness rating.
In terms of pouring, this rubber poured fine, and I've used it in more complicated molds with varied success. It will probably take you a few tries to get it just right.
Smooth-on provides the hardness and viscosity ratings on the product page, including charts to help you find just the right material for you.
Planning on making urethane body pieces for cosplay...does this method work depending on the firmness of the urethane? Cure times? Demold times? do you recommedn slush casting?...so many questions :)
I haven't done a lot of cosplay, but with a good plan I'm sure this method could work for you. If I were going to do something similar I would sculpt the body pieces in clay (or whatever you like to sculpt with) and take a mold of it, then pour the urethane in the mold. Slush casting would be fine.
There are also lot's of materials you can sculpt with that will become the actual piece, no molding or casting needed. Google "worbla" as an example.
Can you cast silicone into silicone or urethane into urethane?
Yeah you usually can, the important thing is to use a mold release coating. Anywhere that silicone touches bare silicone they will bond together (I think urethane is the same but I don't know for a fact)
Hey dude u look perfect for the robotic humanoid project I'm working on. Like ur enjoyment toward getting dirty into all the tuff stuff. Would u be up for discussion, do u have contact info? Either way loved the vid dude, that was great!!
Thank you
Is there a clear and flexible urethane out there??
Check out SmoothOn ClearFlex urethanes, I haven't used it before so I don't know anything. Good luck!
Did you use arcylic paint for the color? What did you use?
+I Killed The Legend27 I used smooth-on's urethane tint set, you can find it on their website
KaiCrafted Thanks! Hah, I like your hair!
Glad to know that I have all I need.
Can I make a mask using this same method?
Sure you could, you'll just need a mold. You can sculpt the mask and take a mold of it, or buy something suitable as a mold like a mask from the hobby store.
Hi!
Isn't this stuff toxic? 😮
Certainly, with the right exposure. In this project I was using such a small amount and with ventilation moving the air away from my face so I accepted the risk, if I had caught a whiff of the rubber I would've put my mask on. My standards don't need to be everyone else's, even I'll admit I screw up sometimes (in at least one other vid you can see I'm not wearing a dust mask when I really should've been). Always check your material safety data sheets and choose to protect yourself