Molding question

[Dracogt]

I'm molding with rebound 25 and I was wondering if anyone had tried adding cornstarch to help thicken it. I know there is Thi-vex, but I'm just curious if cornstarch can be used as a cheap alternative. I've heard of Oogoo which is a mix of cornstarch and silicone caulk. So i figured it might work for rebound too..

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[Drack]

In my mind I don't think this would work but then I am no chemist. I would just mix a tiny batch up to test it out and see if it cures properly.

 

[Zantergog]

In theory it should work, but as Drack said, run a test before you try anything important. There's always fumed silica, just don't breathe it in.

CAB-O-SIL Fumed Silica in Unsaturated Polyester Resin - Cabot Corporation

 

[Dracogt]

If anyone was curious, I did a small test of varying amounts of cornstarch. It doesn't impede on the curing of the silicone or anything, but it (unsurprisingly) drastically affected it's tear strength. And it requires a lot of cornstarch to make it significantly thicker in consistency. So not worth it.

And now you know...

 

[TigerStoneFX]

Thi-Vex is designed to thicken without redusing the tear strength as much as something like Cabosil will although I'd imagine even that would be better than cornstarch for stability but adding anything is will reduce tear strength in the end.

It often saves a lot of hassle to get the intended products, I've learned that lesson from my early days and as much as it pains me to pay some of the prices we have to, its better to spend a little more than have to spend twice as much to start again lol

But thats not to say experimentation is a bad thing, many good things come from that too

 

[tamplain]

If anyone was curious, I did a small test of varying amounts of cornstarch. It doesn't impede on the curing of the silicone or anything, but it (unsurprisingly) drastically affected it's tear strength. And it requires a lot of cornstarch to make it significantly thicker in consistency. So not worth it.

And now you know...

Easier or harder to tear?

 

[Dracogt]

Re: Re: Molding question

Thi-Vex is designed to thicken without redusing the tear strength as much as something like Cabosil will although I'd imagine even that would be better than cornstarch for stability but adding anything is will reduce tear strength in the end.

It often saves a lot of hassle to get the intended products, I've learned that lesson from my early days and as much as it pains me to pay some of the prices we have to, its better to spend a little more than have to spend twice as much to start again lol

But thats not to say experimentation is a bad thing, many good things come from that too

I totally agree.

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[Dracogt]

Re: Re: Molding question

Easier or harder to tear?

It tore pretty easily. Which is bad because rebound 25 is normally very durable.

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