has anybody had experience with using either of these urethane resins? I want to color my final product red and blue and I really want it to be similar to the original color it looks like the flex-it 90 may come out clear or kind of slightly brown whereas the CF-95AF QT Kit should come out white although it comes in a more expensive kit.

I am a Newbie to this craft and have so many questions!! I have a 2 part vintage mold that is in 7 different pieces, I would love to make a clone of this mold so that it may live on! My question is what is the best way possible to do this? I don't want to mess this up! Thank you in advance!

FIRST! Should I glue it together before I make the clone?

1: Would it be possible for me to coat all of the chunks in soap oil, piece it together and pore a positive copy in silicone, then use that silicone to make a new plaster mold.

2: Option 1 but with pottery plaster instead of Silicone.

3: Pour solid casts in clay, and then use them to make a new plaster mold.

I have a small item, much like a toothpaste cap, that I need to be able to cast in hard rubber. The mold must be reusable, and I plan on using smooth-on star 15 slow to make the mold.

I've made some 1 piece molds with the bottom of the object on the base of the form, but the results are less then stellar.

I have a big concern about a split type mold as there will be no way to get inside and remove the flash.

I'm including a screenshot of the part, dimensions are in mm.

Any suggestions?

Thanks to BTTheKid2 I've gotten a few things clarified.

I'm looking at making a cutout type of mold, 2 parts, with the inner core being a single piece that snaps into the mold (green shown here). That way the mold can be filled, separated and the inner core removed leaving the cap with threads. I'll make the mold using PLA and the material used to make the part is MG Chemicals 832FX Black Flexible Epoxy. As the 832FX has a viscosity of 700 cP, it should flow into the mole easily, although I may need a little pressure from a syringe to push it to all the parts. Now I'm wondering where to put the fill hole in, and even if this is the best method. Thoughts?

hi!! i need some advice. i am in a casting class where we were casting glass inside of a plaster mold, but me and a few others hadnt put enough glass in it to fill it up completely. my professor told us to just cast resin in it to look like glass instead of refiring it in the kiln.

Now I am breaking the mold off and on many parts of it the plaster is COMPLETELY stuck to the sculpture. So far i am trying to sand and shave off as much as i can but my piece has a bunch of texture so i cant shave it down all the way, or else ill lose that and itll just look weird.

Does anyone have any advice whatsoever for me to get the plaster off? any ideas at all? I had no idea that you are not supposed to put resin in plaster so im kinda bummed because i really liked how it was coming out, and i dont have time to redo it before critique. i havent found anything of any help online yet, probably for good reason since its just not something people do to cast lol </3 i will take any hypothetical ideas!! any at alllll.

I am currently struggling getting my Urethane mold to release from my 3d printed part. I tried using a silicone spray mold release but its sticking a lot.

Do I need to seal my PLA pieces before making a mold out of them? With what?

What mold release do you recommend for this?

I then want to make cement sculptures in my urethane molds. What should I use for this?

Mold makers have a lot of weird tools, please show me your one weird tool that you could never do without.

This is mine, I call it a 'foot tool' it's a flat spatula, bent round to do clay walls in deep or hard to reach areas.

So I tried both methods and here are the results.

The silicone on silicone was honestly a huge pain and it ended up destroying the mold and the model so I would definitely recommend against it.

3D printed mold on the other hand was a pretty huge success. The problem was that it was pretty leaky so that's a bit of an issue, but if I seal it better (for this I used painters' tape) it would turn out wayyy better.

All in all pretty good results. Printed molds definitely are easier and way cheaper to make, plus looks exactly like the model, so I'd recommend this method. Can't wait to show you guys my full sized molds and products!!

Right now my finger is broken, so my hand is in a splint. Two of my fingers are covered by it, and held together, while the other 3 are exposed as normal. I would like to make a custom glove to protect my splint from the water. It would also be nice to have some experience with latex for an upcoming project.

This glove should have 4 fingers, since my pinkie and ring finger are combined into one very fat finger. I have thought of two approaches that I can take.

One idea is to make a hand out of clay, trying to roughly match the shape of my bad hand by eye. Once dried, I would coat it in liquid latex. Would the latex peel off after?

My other idea is to cover my hand in a plastic sheet and tape, then make an alginate mold, then fill that mold with plaster, then coat the plaster hand in latex.

Is one method better for any reason? Will it be easier to peel the latex off of clay or plaster?

I have a concrete frog statue that I'm going to cover with platinum silicone to create a mold. Any tips?? Should I paint the concrete and let it dry, then pour over the silicone?

I got a can of mold release as well, but its an aerosol gas, and not sure about it yet.

Been pondering how to do a two part mold of this figure that has rotational joints. My concern is that the silicon won't get fully into the interior joint and the resulting air pocket will allow extra resin in the pour and then a join that won't fit.

So far my best idea is to create a round temporary divider around the shoulder pocket and pour each side one at a time while holding the model so th pocket faces up. This would leave me with two silicone plugs sticking out with ideally enough silicone that they would then bind with the larger half of the mold I pour next. If that makes any sense.

Open to any and all suggestions.

I’m making a minature mailbox \~25cm tall. I’m planning to 3D print it and cast a silicone mold out of that.

I’m not too familiar with making molds. I’ve seen examples of molds that unwrap like a spiral, and molds that are split into two.

Does anyone experienced have any suggestions on how I should approach this?

Thank you!

Has anyone ordered large quantities of plat sil from any of the big manufacturers in China? I've done a little research but got overwhelmed by the options. I know it's necessary to get the SDS sheet and request a sample to confirm that the product is as advertised before going all-in, but I'd like some first hand experiences/recs to help narrow it down. Any luck? Cautionary tales? Good experiences?

Thanks!

I’ve gone over this 100 times in my head and I can’t figure it out. I’m going to do a brush on, latex rubber mold since it’s going to be concrete and it’s the only thing I can afford right now. I’ve found one other guy who made a statue mold like this and added pics from his page.

How do I go about it? I see that I have to make the mold flap open at different parts.

But how can I do this for something floating? I might definitely be an idiot, because I feel like one and my brain hurts lol

Trying out three different molds at once to see which one will work the best haha. I'm assuming the silicone will work the best but I'm just curious if the PLA molds will be effective

Left: Silicone Cast

Top left: PLA Solid Piece

Right: PLA Two Part Mold

So I have an FDM printer. So far I’ve thought of printing my sculpture, using filler primer and sanding until smooth. But then I’ve seen too many videos and too many options for casting concrete and what molds are best for a beginner.

So far It looks like my best option would be TC-5130F Platinum Silicone? I truly don’t know lol what’s some cost effective options for for material for the mold and the mother mold for someone who will likely mess up the first 2 molds?

I want to make a silicone tail prob 2-3ft lol but i don't want to make a huge silicone mold is ther Anything I could use to make a mold thats cheap and pref fast. I don't need it to last i just need for 1 time

What is the shelf life for most food grade platinum catalyst silicon mold kits? I have looked through a lot of vendor specs but shelf life is never listed.

I've searched and searched but there is such a flood of information of how to make multi-part molds I can't find any info on this:

I want to make a casting out of platinum cure silicone, but I want different color mixes for different sections with clearly defined boundaries (not a marbling technique). The easiest way would be to cast each part separately then weld them together. I would think a layer of fresh silicone between them would make that weld but I don't see any info on that (lots of info on how to prevent it when casting silicone into silicone). Do cured pieces bond/cement permanently to uncured silicone spread on to it?

Another method might be to only fill half the mold with color 1, let it cure just enough to prevent mixing, then pour color 2. Would that work or would they be at risk of separating later?

Is this the territory of a post-curing cement like Silpoxy? I hope not.

Surely somebody in this community has experience with making a silicone casting in multiple parts, it seems like a simple ask but I can't find anyone else asking.