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"What's the Name of that Reusable Mold Material?" Topic

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Mako1103 Mar 2017 8:50 p.m. PST

Can't seem to recall the name, but think it is something like Umaru, etc..

IIRC, it's produced in Japan, is clear, comes in small, thin, rectangular bricks, and can be warmed up in hot water to make it soft, and then pressed over your sculpts/detailing, in order to make a temporary mold.

Then, you can use that with some air-hardening materials (epoxies, like Green Stuff, etc.), and/or possibly resin, to cast small parts with.

I looked on eBay, under various titles and materials searches, but didn't have any success.

I need to do some vehicle conversions, and cutting the engine grates off the plastic model, and repositioning in 1/144th scale may be a bit dicey, to say the least, so thought this might be a better option. I don't want to compromise the structural integrity of the small, plastic hull.

I'd be fine with other material recommendations for doing the same, if there's other stuff, easily available, from Hobby Lobby, etc.. I seem to recall someone mentioning that as well, and if possible, would like the option to have slightly larger pieces cast too, e.g. perhaps 2" x 2" squares or so, instead of the smaller, strips.

I think someone makes a material that can be microwaved to warm/soften it up as well. Maybe this one can be too.

Also, can use recommendations on what to use, other than liquid resin, to cast the small parts with, e.g. Green Stuff, etc..


Anthon03 Mar 2017 9:45 p.m. PST

Try typing Instant Mold in the game section on eBay, that should steer you to what you're looking for.
As far as materials, green stuff with milliput or a 2 part epoxy in the plumbing section of the hardware store should work. A warning, it will smell. You have a 5 minute work time but it's a good mix. Green stuff helps it keep its detail and the epoxy helps with the hardening. It comes in tubes for a few dollars.

Greylegion03 Mar 2017 10:42 p.m. PST

This what your looking for?


Mako1103 Mar 2017 11:36 p.m. PST

That's it!


I tried looking up various mold making materials and descriptions, and kept getting tons of offers for a Chinese dumpling press for 99 cents.

Grimmnar04 Mar 2017 12:01 a.m. PST


You are looking for Oyamaru. That is the official and original name for what you asked.


Personal logo Jeff Ewing Supporting Member of TMP04 Mar 2017 6:21 a.m. PST

Oyamaru is terrific; Micromark sells a heat and pour reusable I'm thinking of trying out. As for casting material, if you put Oyamaru into the YouTube search, you will find several videos about using various epoxy putties.

Mako1104 Mar 2017 3:39 p.m. PST

Yep, that is it.

Thank you.

Personal logo Dye4minis Supporting Member of TMP05 Mar 2017 2:53 p.m. PST

In Europe, Faller (the model building folks), will be releasing what seems to be the same stuff. It is item 171665 and is called "Abformmasse" or mold compound. In their latest catalog for new items in 2017, the scheduled relase date is July 2017. They will also be releasing 171666 Parting agent and 171667 118ml 2c casting resin. One part (looks like) and claims it is great for small parts and cures in 45 minutes. Remaons crystal clear. (Aircraft canopies or cloaked spacecraft anyone?)

This stuff will NOT be cheap! 39.95 Euros )about $43.50 USD at today's rate) for 560 grams of it. Nice thing is that they claim you cam re=use it up to 35 times by melting in hot water or microwave. Sounds like the same stuff repackaged?

jah195605 Mar 2017 3:17 p.m. PST

Dye4minis No that is Composi Mold The stuff in sticks is Blue Stuff from Green Stuff World Spain or Instant Plastic Clay thetrolltrader UK. Composi Mold is good for pouring Cold liquid into not so good for paste and not for water based liquids. Blue stuff or Instant is good for paste and water based stuff. For hot stuff metal/lead Silicone And Cornflour/starch mix.

wardog14 May 2017 11:49 a.m. PST

blue stuff/instant, can it be used for 2 part mold (what would you use to keep 2 halves separate given heat makes it soft and stick together )
if above possible okay for pouring resin?

jah195614 May 2017 5:55 p.m. PST

Yes best to cast one half put it in the freezer for a hour or so then cast the other half has always worked for me.

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