Resin casting tutorial

Subject: Resin casting tutorial Sun May 13, 2012 6:40 am

Here's the tutorial you have benn asking for.

Open moulds for bases and other things with a flat back.

Tool's and other need's:
Silicone rubber and catalyst
Resin
A suitable container to make the mould in
Disposable mixing cups/containers
Disposable sticks for mixing
A scale that can weigh very small amounts
The base you want to replicate
Bluetac

First you take the base and stick some bluetac in the bottom. Then place it firmly in the container you want to make the mould in:

Then you mix the rubber with the catalyst until it hase a nice even blue tone:

Then you pour it into the container with the base. It's best to start around the base and let it flow over the base from the sides to minimize the amount of airbubbles:

Tap it down on a hard surface to release any airbubbles that may have formed and let it harden for 24 hours:

Peel the mould out of the container without forcing it too much. It's best to loosen the sides first and the peel it out:

Remove the base from the mould and trim the edges if you need to:

Now you're ready to make some copy's:

Mix equal parts of the two resin components and mix it well for about 20 seconds:

Pour the resin into the moulds. The resin only has a working time of about 2-3 minutes so do it fast but don't stress it. Less is more:

Let it harden for 15 minutes:

Pop the hardened resin casts out and trim the edges if you need to. and you're ready to paint:

Stay tuned for part 2 with two-part moulds Very Happy

Subject: Re: Resin casting tutorial Sun May 13, 2012 7:00 am

Wow! this is great!

I can't wait to see how you do models or pieces of a model.

Subject: Re: Resin casting tutorial Sun May 13, 2012 7:10 am

How many casts can you make from one form?

Posts: 50 Join date: 2009-09-03 Location: Sydney, Australia

Quote:

How many casts can you make from one form?

Wait! I know the answer to this one... it's a shitload, yeah?

I've found that my one part moulds would often come out not quite flat on their flat edge - having a bit of a curvature to them. In order to encourage them to catalyse flat, I tried resting a few different things on the top of the mould while the resin hardened, and found that far and away the best thing to place over the moulds was the flat side of other one part moulds I wasn't using at the time. They're good and flat, and (as you'd expect) resin doesn't stick to them at all.

Subject: Re: Resin casting tutorial Sun May 13, 2012 9:26 am

Komfritten wrote:

How many casts can you make from one form?

He he, I do believe a shitload is a good answer. Though I read somewhere that a mould will loose detail after 20-30 casts because of the heat the resin generates.

lakedaimonioi wrote:

I've found that my one part moulds would often come out not quite flat on their flat edge - having a bit of a curvature to them. In order to encourage them to catalyse flat, I tried resting a few different things on the top of the mould while the resin hardened, and found that far and away the best thing to place over the moulds was the flat side of other one part moulds I wasn't using at the time. They're good and flat, and (as you'd expect) resin doesn't stick to them at all.

Yeah the backsides does not come out completly flat but I just sand them down if they are wobly. It's a good idea about placing another mould on top. I'll try it out later Very Happy

Subject: Re: Resin casting tutorial Sun May 13, 2012 9:39 am

Seems simple enough... now... how you do a TWO part mold?

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Subject: Re: Resin casting tutorial Sun May 13, 2012 10:58 am

Relaxe dude. The rubber has to cure for 24 hours. The first halves are ready but I haven't had time to do the second ones yet.

Patience is a virtue Wink

Posts: 119 Join date: 2011-01-23 Location: Texas, USA

mudboy wrote:

Komfritten wrote:

How many casts can you make from one form?

He he, I do believe a shitload is a good answer. Though I read somewhere that a mould will loose detail after 20-30 casts because of the heat the resin generates.

lakedaimonioi wrote:

I've found that my one part moulds would often come out not quite flat on their flat edge - having a bit of a curvature to them. In order to encourage them to catalyse flat, I tried resting a few different things on the top of the mould while the resin hardened, and found that far and away the best thing to place over the moulds was the flat side of other one part moulds I wasn't using at the time. They're good and flat, and (as you'd expect) resin doesn't stick to them at all.

Yeah the backsides does not come out completly flat but I just sand them down if they are wobly. It's a good idea about placing another mould on top. I'll try it out later Very Happy

I can't remember if it was on this forum or another, but I saw mention of resin wearing out molds as well. It was a topic about Hirst Molds IIRC, the guy was casting like crazy (floor tiles I think) and they started to fit together wonky. Casting your own = no problem, just keep your original blank. Using Hirst Molds...better make a copy of the mold before working in resin.

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Resin casting tutorial

Resin casting tutorial

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