Tutorial | How to make and use Sprue Goo | #askHearns

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BJ talks about Sprue Goo. What is Sprue Goo?
Sprue Goo is polystyrene plastic that is chemically melted into liquid plastic by adding plastic cement. The liquid is then used to fill gaps, add strength or creating texture on surfaces.
Use your leftover sprue from your kits and create this very useful and versatile Sprue Goo.

As a filler, Sprue Goo has the advantage of bonding to both sides of the plastic part whereas regular fillers can pull away from the plastic being filled.

Add strength by adding fillets of Sprue Goo to add mechanical strength to parts.

Create rough textures by brushing Sprue Goo over the surface of your model.
Sprue Goo will bond to any surface and material.
On smooth materials such as glass, the dried Sprue Goo can be peeled off and used as a thin sheet for scratchbuilding.

Items used in this tutorial:
Liquid Cement

Polystyrene plastic
Use the leftover sprue/runner from your plastic model kits

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[wRAAh]

0:51 If the bottle is low, you can lower the brush by pulling it out a bit with a pair of pliers. It's designed with that in mind!

[schirmoau]

Thanks Guys very handy hint for someone who's only just back in the game after being absent for 30 years!

[tippo]

Great content and much more thorough explanation of the goo’s use than many other tutorials, thanks guys 👍🏽

[sg]

Great video. What is the shelf life once you've made the sprue goo? Will it harden inside the bottle over time? Will the brush clog up? Thanks in advance, Cheers, Steve

[howardmoon]

I made a bottle of thin mix for thickening joints. Among other uses, but mostly for joints.

[leonardusgroenendyk]

The Tamiya brush is extendable so when you are running low it will reach the bottom....check it out.

[rosemaryr.long-morgan]

Thanks for sharing. So, You recommend usong the extra thin over the reg. thin? If I'm converting a 4 door to 2 door, would You suggest a fairly thick solution to cover up original scribe lines? Thanks
/Rosemary

[Kaijushorts]

Great stuff guys, I've been trying to look into this for a while, I've got some old kits that really need a good solution like this

[chrisclifford]

Hi when you cut the figures for remodeling, what is the best way to cut without losing too much material. Thanks, Chris....

[Mackenzi]

Is there any danger of the liquid cement melting the plastic container that you’re putting it in? I have two brand new bottles and I would like to make this stuff but I don’t want to dump out half of one of them to do it, so I’m trying to find a container that’s safe to put the extra in.

[kenjones]

Hey BJ what other solvents could be used ?

[montlejohnbojangles]

Cool! Thanks man, that's a neat trick. Never really considered this, but it'll make a good use for my old bottle of plastic glue! ✌️

[paulgertsch]

You never discussed the Mr Hobby cement that you had on the table. But I guess that you can also use it to make the spru goo ?

[anshuldwivedi]

How many models does a typical 40ml bottle of the cement last?

[marknorris]

u are using a plastic tub for this project. Does that not melt when you add the glue to the sprues?

[djawda]

Hi what plastic did you usiedli becouae i put difrent plastic and it doesn’t melt :( 😢

[raymondchapman]

What nippers are you using ? They orange handle pair ?

[sabrekai]

I've made up 3 different batches. Tamiya extra thin, and sprue from the model I am working one. Thin or thick makes no difference. Fill the seam, let it cure for 24hrs and shave it down. I get hundred of tiny bubbles, .1 mm and smaller. So far apparently I'm the only person to have this happen. Any idea why?

[BennyCFD]

can use a bottle of Tamiya thick cement. Just leave the cap loose for a day or so and the solvent in it will evaporate a little or until you get the thickness you want.

[hugosinnicks]

Can you use sprue goo with Blue stuff?