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Make a Dragon Glass Dagger from Game of Thrones


This is a tutorial sent in by a web visitor (Paul H.) He figured out a terrific way to make the glass dagger and he shows us the process, step by step.

This is also an excellent tutorial on how to make something with a two-part rubber mold. You can use what you learn here to make just about anything in a rubber mold.

My thanks go to Paul for sharing this tutorial with us! He has submitted lots of great stuff to this website.


Here is the Glass Dagger we make in this tutorial. It just needs paint.

The dagger without paint


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Apply template to wood

1. Starting as always with a paper template.  Then marking out on plywood.







Add air dry clay
2. Building my positive with air dry clay.
As this is meant to represent obsidian (which like flint fractures conchoidally.) therefore using a spoon I made it look knapped.







Mod podge it

3. Both sides shaped and sealed with good old Mod Podge.






Roll out clay

4. Using some sulphur free clay I rolled this out and scraped out a "cradle" for the positive to sit in.













Carving it

5. Carving out with wire tool.













Shape clay around the model

6. Shape clay around the positive. (Note the Foam Board box floor in place.) I used some wire to form the expansion channels and an air dry plug to create filling funnel.





Seal it with glue

Hot gluing rest of form. *Make sure that there are no gaps between board and clay.







Add indentations

7. I used a pen to create the indentations that would become locating pegs for 1st side of silicon.







8. Calculation of silicon for mould. Using some kitchen film draped over and filling with dry rice to cover the positive approximately 1 inch above its highest point. It makes it easier to weigh in a container on digital scales. Weight of rice = weight of silicon for one side of moulding. Hardener in this case is 5% of weight of silicon.


Remove bubbles

9. After mixing thoroughly - until hardener no longer appears streaky. It is poured into container.
*Lift mix high as you pour it onto one end and allow it to gravitate to cover it all.
*see Will's Glass dagger project.

Bubbles will start to form but if you blow on them it dissipates the surface tension or you can employ the air brush to achieve the same effect as I have here.




The rubber is cast

10. This is result.







11. Tips - make sure you have digital scales that can zero a container then measure the quantity you require accurately. Make sure there are no gaps between clay and sides. Make sure that you have enough material to make your full moulding. In making a dagger or bladed item such as this it is difficult to gauge the amount of positive exposed to silicon. Can make the difference between a deep blade moulding and a poor shallow one.

12. The next stages are, removing the foamboard sides to dismantle the clay. If you can re-use them do so if not then remake around the positive and silicon.
Your weight to hardener ratio will be the same for 2nd pour. * The supplier of my silicon suggested that as silicon will stick to itself then a release agent such as petroleum jelly mixed with a little methylated spirits should be enough to separate sides. 24 hours later - separate sides. I used baby talc all over the silicon pieces to absorb any areas which were still sticky.

Next Continue with the tutorial



Make a White Walker Spear from Game of Thrones

This is an easy to make spear and we use a neat material called insta-morph to easily create the tip. Make a WhiteWalker spear



Game of Thrones: Make a Dragon Glass Dagger

I show you how to mold plastic very easily to make this dagger from Game of Thrones. Easy easy project. And the plastic is quite amazing. You can make just about anything from it. Make a Dragon Glass Dagger


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