6 step Instructions for Silicone rubber mould making *FREE Download TIN Cure with Catalyst


BRAND New - perfect pouring Condensation type Liquid Silicone Rubber & Catalyst. We now have a new catalyst - blend at a 3-4%. It has fabulous smooth viscosity, will eliminate most air bubbles with a slight agitation, prolongs the pot life, and has a 24 hr set time.

This download is for a FREE printable A4 Instruction Sheet to assist with your mould making. See images for sheet.


CATALYST COLOURING: To colour, you can mix some mica with your catalyst (Make sure it is Renascent Bath & Body Mica as we not sure how others may react), add a small amount in, close the lid and shake to colour, (it will settle over time, just shake before use) By colouring your catalyst you can see the colour swirls when added to the silicone and ensure it is well blended.

PREPARE YOUR MASTER: The master is the object you are using to make your mould (any medium except silicone or silicone containing mediums)

You can bed the master on a sheet of contact or packing tape (sticky side up) for a lovely flat surface, Use  playdough (good recipe with the thermomix – cheap and easy to reproduce and if sealed keeps for months and can be reused) as a flat base (use a rolling pin) or Clay, then press your master on gently and add the surrounds/wall. Attach the master to the base (so it won’t float in the silicone) you can use a hot glue gun or press it into playdough/clkay/sticky paper. Make sure there’s no gaps.

SURROUNDS: Create a wall around the master, eg a cardboard wall or lego brick wall, (we use playdough for small objects less than 3cm high). You can use take away food containers, plastic or paper cups or poly pipe *TIP: If using poly pipe line with a plastic sheet firstly – laminating pouches are flat, cheap and easy to cut up to fit. This will allow easy removal on taller objects.

MIXING: Open the silicone rubber container and stir extremely well - if you find that there are any lumps in the base of the container blend until the lumps become smooth again if you cannot smooth out all the lumps just throw those small pieces away before use. Make sure you have this blended well before you add the catalyst as once you add the catalyst you only have a very short work time.

MOULDING: If the mica has settled in the catalyst, shake well, then add the catalyst at 3-4% to the silicone, Mix well so it is fully blended, if you get pockets not blended it won't set, if this happens, leave it for 3-7 days, it may blend through, but best to mix well. 

Have your master ready to go with the surrounds made and then pour the silicone rubber in a thin stream - over the side of your master, allowing the silicone to flow up from underneath, thus filling any crevices or marks and preventing air bubbles. (If you pour directly over, you may trap air bubbles). Fill to completely cover the master.

Take a skewer or metal fork and gently stir, poking down the side to ensure any trapped air bubbles are released and pop up to the surface where you can pop them with your skewer. 

You have about a 5-10 minute work time before it goes sticky and 4-24 hours complete cure time - allow to set for 5 to 24 hours 

Once fully set, peel off your surrounds and pop your master out of your completed silicone mould

Give it a wash with warm soapy water, you now have a mould ready to use many times.

As we are professional mould makers and make hundreds of different moulds we are here to assist you if you have any questions or concerns.

It is fine for impression mats although don't pour silicone on silicone as they will firmly stick together. If over a plastic or lace cloth should be fine.

This information is copyright © Renascent Bath & Body / Lesley Mitchell
Individuals must test a small amount first to determine suitability for their purpose. *Wear gloves and eye contact and do not allow the catalyst to come in contact with skin or eyes, if this occurs, flush immediately with water and if in contact with the eyes, seek medical attention.