6th December 2016

Finished star blog use

How to make a 5 pointed Christmas star

Charlotte Hern from the Modern Souvenir Company in Bath gave Kirstie an introduction to what she describes as one of the most satisfying crafts she’s ever done.

What you need:

Rolling pin

Knife

Scalpel - but these aren't essential as cocktail sticks can work too.

Print out template of star/shape

Ruler

Pencil

Modelling clay

Decorative accessories- i.e. stick-on gemstone, lace, or any objects for textures

Plastic tub or foam card to make small box

Pots to mix & spoon

Silicone mould making rubber and catalyst

Plaster-cast – Crystacal R is used in the programme

Metallic spray paints

Gold/silver leaf for finessing

 

There are quite a few steps to make the star shape but once complete you will have a mould that can be used time and time again.

To make one fifth of your star shape:

To start you are going to mould and cast one segment of your star (1/5th  of its shape, a diamond), then make 5 replica copies to piece together that will make the finished star shape.

First of all, draw your Christmas star shape on a piece of paper and divide into 5 segments using a ruler.

Then using a rolling pin, roll a sheet of modelling clay until its approx 0.5cm thick

Now using your paper star template cut a single diamond shape ( 1/5th of you star shape) with the plasticine using a scalpel (cocktail sticks can work just as well).

You can leave impressions on your clay diamond shape with accessorise such as jewellery, buttons or whatever you fancy to add some texture.

Once you’re happy with the design of your Christmas star, you need to create a mould and cast 4 replica copies. For this step in the process, you require a homemade mould box made of foam or you could use a Tupperware container as well as silicone mixed with a liquid catalyst.

Measure out 100g of silicone liquid mixed with about 10g of liquid catalyst (silicone comprises of 2 parts with a ratio of 1 to 10 silicone to catalyst). Give the mixture a good mix before pouring into your mould box or Tupperware.

Place your clay model diamond shape into the mould box and slowly pour the silicone and catalyst mixture in fully covering it. To avoid air bubbles, pour the mixture in from a height to allow the silicone to stretch and pop the air bubbles otherwise the mould won’t hold its desired shape.

Once the silicone is set which should take approx. 12 hours, pop the clay out of the mould. You now have a mould from which you can cast the 5 identical parts of your star in plaster. 

To make your 5 pointed Christmas star:

Next add two parts Plaster of Paris to one part water and mix with a spoon to the consistency of double cream. Plaster of Paris is really hard and picks up all the details, however, you can use other plasters.

Pour the mixture into the silicone mould you made earlier and leave to set for 45 minutes. Repeat this process until you have cast 5 diamond shapes.

It’s important to note that your plaster casts come out damp.  They need to be dried on newspaper in the sun or somewhere warm for an hour or so. This is the same for the complete star, leave to dry for a few hours after dipping. Do not leave damp plaster on wooden surfaces or fabric as it will stain.

You’re now ready to glue your diamond shapes together to make the star.

At this stage you require a 2nd  larger mould box to fit your 5 shape star into

Simply place each shape into the box in the shape of a star and glue them together filling any gaps with modelling clay.

Now pour over the prepared silicone and catalyst mixture, again slowly and from a height to avoid air bubbles. Once this is dry (approx. 12 hours) you will have a cast of a star shape.  From this you can now cast as many more as you wish. Should you want this to be a hanging decoration, pop a straw through the plaster at one of the tips to create a hole.

Leave for up to 45 mins to allow the silicone to dry, then pop your finished star shape out of the mould.

Decorate as you wish for example using metallic paint or a gold leaf transfer.

Carrie hunter

Author

Carrie Hunter