Mold making and casting tip: Casting Rubber

[KRYSISJAG]

If I wanted to make a shape for example.. a rubber star, or heart and i want to stick it on my body (the finished product) for a project are there any toxin that will cause any skin rash thanks also where can I learn more about the properties of PT Flex 60 thanks

[brickintheyard]

@KRYSISJAG Something like that would be better made out of Gel-10. The PT Flex series is probably too stiff. All of our technical data sheets and MSDS literature is available on the "technical data" page of our website.

[KRYSISJAG]

@brickintheyard thhanks heaps looking forward to researching this is my starting point thanks heap for your diection cheers KRY

[rodentum44]

how would you go about making the original mold for the rubber to be poured into it?

just shape around the item your trying to copy?or some other way?

[brickintheyard]

@rodentum44 Check out someof our other mold-making videos. The "basic silicone mold" video gives a good explanation of the mold process.

[BenSteenbeck]

Very nice video. I like the PT Flex material but it doesn't seem to be available in my region. What kind of material would you recommend to get the same soft elastic result? Thanks.

[brickintheyard]

@BenSteenbeck Not sure. PT Flex has some very exclusive features. Check to see if there is a Polytek distributor in your area.

[alexi96]

nice work! approximately how many times can you cast from the same silicone mold?

[brickintheyard]

@alexi96 Depends on which resin or rubber is poured into the mold, the frequency of casting, and the mass of the part. A mold like this can yield well over up to 100+ parts if made right and castings don't have too much mass.

[richardarichter123]

does the rubber mix give off a vapor like paint stripper or fiberglass mix something not good to breathe

[brickintheyard]

@richardarichter123 These urethanes are very low odor. Decent ventilation is allways a good idea but they smell nothing to the degree of polyesters.

[richardarichter123]

@brickintheyard ok thanks look to make rc car tires do you know what kind of rubber you can use for rc car tires

[raminatox]

I want to make a mold using an airsoft gun. how do i prevent the silicone from entering the gun?

[brickintheyard]

@raminatox Use some modeling clay or vaseline to fill in any openings in the gun.

[raminatox]

I think it is a Beretta Cheetah, because of the short barrel.

[supermarioguy100]

what gun is this?

[brickintheyard]

@supermarioguy100 Not sure.

[KewneRain]

@supermarioguy100 Looks like a Baretta M92, but it's got FN's logo on it.

[AdamTheGuitarHero]

@supermarioguy100 Its a beretta M92FS, well, it looks like it.

[TheGamersinc]

How much is silicone normally? im making a Indy zombie movie and need to make rubber pistols. you guys do an amazing job!

[brickintheyard]

@TheGamersinc Check our webstore for up-to-date pricing. Silicone and urethane rubber fluctuate with the petroleum market.

[guitar74747]

@TheGamersinc sounds interesting, send me a link when you finish it?

[FirearmsAmmunition]

where to get vacuum chamber?

[brickintheyard]

@FirearmsAmmunition PT Flex does not need to be degassed but if you need a chamber for degassing silicone you can go to Grainger and get a vacuum pump. There are some basic instructions on assembling a vacuum chamber in our molding casting handbook. It is a free PDF file on our webstore.

[gothiczartan84]

i thought about using this stuff to cast gi joe parts like antennas

[sirbrad4]

Will this rubber work inside a Plaster of paris mold and do you need a release?

[brickintheyard]

@sirbrad4 Yes, but you do need a release. A plaster mold requires a sealer such as mold soap and a release such as 2300.

[d1v4dPwnz]

I WANT ONE!

[jon6123]

does anyone know what rubbers are petrol resistant? i want to reform a fuel stop needle head inside a carburettor, any ideas?

[brickintheyard]

@jon6123 Most of our urethanes are fairly solvent resistant but you would need to run your own tests for an application that specific.

[nixymagoo]

@brickintheyard good video mate. Do you have an instructional video that shows how youmade the cast ?

[brickintheyard]

@nixymagoo Not of this particular mold, but the knife mold is made the same way.

[oneevil666666]

i want to cast my oil based sculpture in fiberglass, so i can make latex masks out of it, the question i have is, do you have any info and supplies that i can use to cast this mold? i use roma plastina oil and sulfur based clay, and want to know how it should be prepped for casting... what type of mold release should i use because there can be reactions to the fiberglass because of the clay being oil based and sufur based.. please help!!! thanks

mike

[brickintheyard]

@oneevil666666 Ask your fiberglass/polyester resin supplier. We mailnly supply polyurethane resin and silicones.

[Straycat5669]

Really great and helpful ty

[MonoxideChild1219]

Would PT Flex be hard enough for a knife handle?

[brickintheyard]

@MonoxideChild1219 Use PT Flex 60. It might still need a rigid core depending on the application.

[MonoxideChild1219]

@brickintheyard Where would I find it?

[brickintheyard]

@MonoxideChild1219 Our webstore. The full PT Flex line is not up on our webstore so call us if what you want isn't listed.

[OuroborosOfGreed]

How do you cast the mold for the gun without mucking up the gun? Do you just clean it thoroughly?

[brickintheyard]

It is best to use oil clay such as Klean Klay to block out any open areas to prevent the gun from filling with silicone and then clean it later.

[iashakezula]

The PT flex 60 is more flexible, what if you want it more rigid? Can you use Easy Flow 60 clear?

[brickintheyard]

EZ Flo 60 is rigid as well as EZ flo clear.

[eviltig]

Where is a good source to purchase the resin from and other items like mixing cups ect.

Thanks, and great video!!

[brickintheyard]

Why BITY Mold Supply of course! Our web store has resins, silicones and calibrated mixing cups. The link is at the end of the video.

[eviltig]

Shows how quick and unobservant I am (haha) thanks!!!

[eviltig]

Ordered up some supplies today, thanks for all you help and patients with all my questions you guys rock!!!

[brickintheyard]

Thanks! Good luck with the project!

[roadkillontheweb]

do you make a material that could be used to reproduce gas and brake pedal pads on antique cars? This material looks a little too flexable

[brickintheyard]

There are several stiff rubber products that would work for that. 75-80 is stiff, abrasion resistant, and may be pigmented black.

[funnybunnywithlemons]

can u use alginate

[brickintheyard]

Probably not. Most urethanes foam like crazy if poured into an alginate mold.

[fhdwagads]

Anyone have an idea as to the type of rubber to use if you're trying to make an outsole for a shoe?

[brickintheyard]

Not sure.

[VvInstinctvV]

Why didn't you leave a vent hole one other molds that you have made?

[brickintheyard]

????? There is a vent carved into the mold from the trigger up to the top of the mold with the pour spout.

[VvInstinctvV]

Sorry, I meant like on your other molds (not this one) you have not always included a vent hole, and I was wondering why.

[brickintheyard]

The casting material had to be poured quickly through a small opening. In order to get the air out as the rubber is poured in a vent is made. This also helped keep the trigger bubble free.

[7olusegun]

Anyone knows the resin(s) ingredients for hard and durable plastic?

[brickintheyard]

EZ Flo 60 is a good, tough plastic. Mix it with PT Flex and it becomes semi rigid.

[RardSFX]

I presume you made the mould from a real handgun. I am just wondering if this causes any problems with the gun afterwards? does the silicone get inside the gun and require an extensive clean up?

[brickintheyard]

Yes.

[RardSFX]

Ah, okay. Don't think I'll try that with anything expensive then.

[hiitscory]

Try using a cheap airsoft handgun from walmart that you dont care about

[brickintheyard]

Yes. That is the safe approach.

[londongamer]

Walmart,.. "Welcome to Walmart - now get your s**t and get out!" - Oh I think Jeff Dunham & Walter are excellent. :D Hehe.

Seriously though - thanks for the video, very helpful. :)

[brickintheyard]

Huh?

[londongamer]

It was the reference to Walmart that made me think of Jeff Dunham, he's a very very talented and highly-viewed ventriloquist here on YT, he tours the USA and has a handful of really funny lil friends. One such friend is Walter.

Keeping on-topic,.. your videos have been very helpful to me, thank you. I'm deciding if I want to go through the added expense to make a custom mould for one-off special 'form' I have designed, for my GF.

[cyberjedi13]

yea that would be cool make a how to video :)

like an iron man suit

[moneyboi50]

can u plz make a how to on a hero suit(like a batman or iron man or something)

[cyberjedi13]

THAT WAS COOL! sell any molds?

[brickintheyard]

no, Just the supplies.

[gus361]

great tutorial, how much it pt flex?

[brickintheyard]

Cost?

4lb kit=$60

16lb kit=$135

[SkilfulPenguin]

what happens if u get air bubbles?

[brickintheyard]

One of the reasons we used PT Flex is the low viscosity. Very few if any bubbles occur.

[redf11]

Supeeeeerrrr cooolll!!!5 stars!

[KwixAK]

Glad to see you put some of your videos back up!! You have some really great "how-tos"! Dare I ask what caused them to be pulled in the first place?

[brickintheyard]

Only if you have a 12 pack to share.

[Halo0054]

Exelent Job... I'd hate to get pulled over with that thing lol

[benisbob]

thanks this is a really gd video

[lex0014]

i learned a lot, but how did u made the silicon mold for the gun?

[brickintheyard]

Go to my channel page and look for the silicone block mold video. It is a knife mold but the same process.

[Gonamez]

Thanks i learned alot! Thanks