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01 Jun 2010 - 16:0033092
Jesmonite. Has anyone used it before?
Hi there,
I'm planning to make a costume using Jesmonite layed on top of polystyrene to give myself a fairly light but bulky looking appearence that I can also have a nice smooth coat on the outside that can be buffed up and sprayed nice and shiney.

Think something similar to THIS and THIS in terms of size and shape.
At the moment though this is still a maybe

I have a couple of questions about this, namely:
1) What is the expected 'consafe' reaction.
2) How durable is it likely to be (I've been told it could be brittle yet I have also seen a man jump up and down and use a mallett to break a pualdron made of the stuff)
3) Is sanding down and respraying viable
4) Does it really have to be cast, seen as I'll be sanding it anyway (can it just be layered on top easily)

These are just a couple of questions that I needed to ask for now but I have no doubt they wont be the last!

Cheers,
Captain


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Duck! - As a defensive strategy it's unreliable, but it's incredibly reasurring if only for a little while.
01 Jun 2010 - 16:4533099
I've only done tests with it so far but it seems pretty safe to work with, easy to sand/fill/paint/etc and while casting is preferred it can be painted on too

Bear in mind at that size it's going to be heavy, and doorways will be an issue, but as long as sharp or pointy things aren't sticking out you should be okay consafetywise

By itself it's brittle, added directly onto the polystyrene will help but not much.. I painted a single layer on top of plain foamboard and it took a couple of big whacks before breaking in half. It's highly recommended to layer with fibreglass or similar, but at least it isn't deathly like usual fibreglass resin is - still would recommend gloves/dustmask when working with though.


03 Jun 2010 - 21:1433350
Hi Nert, and thanks for the reply.
I was thinking of layering it with one or two layers of Quadaxial Glass sheeting or maybe add strength by using loose fibers where appropriate.

I'm a bit worried about the weight now as I assumed it would be pretty light.

Although with my current build I think I should be able to handle 15-20 kgs if balanced well.

thoughts?


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Duck! - As a defensive strategy it's unreliable, but it's incredibly reasurring if only for a little while.
06 Jun 2010 - 13:0833676
Hei, ok first of all... be veeeeeery cautious when sticking that stuff on polystyrene... i dont know about jesmonite but its cousins polyester and epoxy resin create some sort of super napalm when combined with polyester....... NOT GOOD XD... so test how they react together with a small batch.

for strength i think you will find it is extremely britle and will crack under the thaught of bending. this can only be fixed by layering it to about 1CM thick....

apart from that the stuff is extremely expensive and i dont think it would be ideal for a costume of such scale.. i spent up to about £400 on my armour suit (pls take some time to study it XD) and that is a considerable amount smaller than that.

i would recomend you look into Epoxy Resin, it certainly wont mix well with polystyrene but it is light, flexible, uncrackable, unchipable and basicaly just god... XD i beleive it is a bit cheaper than jesmonite yet still 3X more expensive than the brittle cheapskate option of polyester resin.

also... please please please be carefull when working with resin / fiberglass O_O there are so many things that can go wrong dont wana see you loosing an eye or geting mega skin burn :O pm me if you need any ideas ;p im sure i can be of good use to you XD


--edit--
Its gona weigh a TON if you use resin XD....


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Last edited by keir160 (06 Jun 2010 - 13:08)
06 Jun 2010 - 15:2133689
i wouldn't go near resins/grps/jesmo for something like that =x

i'd build the base shape out of cheap ass furniture foam, then 6mm 'zote over the top. wearing a suit that size and shape made from a solid state material would be about as fun as drilling your own teeth.

[edit]

also, jesmo is fairly coldcure. it's an ok material, but wouldn't be my first choice.


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Last edited by xaerael (06 Jun 2010 - 15:25)
06 Jun 2010 - 17:5433715
Quote xaerael:
i wouldn't go near resins/grps/jesmo for something like that =x

i'd build the base shape out of cheap ass furniture foam, then 6mm 'zote over the top. wearing a suit that size and shape made from a solid state material would be about as fun as drilling your own teeth.

[edit]

also, jesmo is fairly coldcure. it's an ok material, but wouldn't be my first choice.


Hell yea. id definaitly back that one up. go for a foam aproach, there are a few sites online i could direct you to that sell foam at any scale ... just buy blocks and carv it up with a bread knife or eaven better a chicken carving vibrating knife thing. XD


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My life is my heaven, your heaven is my hell.
09 Jun 2010 - 14:3833989
Hi there guys.
@Xae: the reason I am planned on Jesmonite in the first place was so that I would be able to rub it down after and repaint in any other colour I might want or change for things like battle damage and the like. I could use any type of fiberglass but I thought about jesmonite for safety since it's waterbased.

The costume in the example is not actually what I want to make but does share a very similar bulk and poise.
I'm keeping the actual costume a little close to my chest.

It might be a good idea to use Plastazote for pieces I need to keep bendy such as the arse so I can sit down or the inside of joints/gloves.

Another material I have just started looking into is vacuum formed plastic or (EVA foam) but I dont expect it to be very good for large bulky pieces, maybe something as big as a bracer or thigh armour but not a chestpiece for instance.

Thoughts?


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Duck! - As a defensive strategy it's unreliable, but it's incredibly reasurring if only for a little while.

Last edited by Captain (09 Jun 2010 - 14:42)
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