Aldax Mould Making And Casting Blog

Question:

Hi. I was wondering if you can help. I would like to make a plaster reproduction of plastic lunchbox. I intended making a negative mould using latex or silicone. Can you advise me which products I should use to achieve the following?

• No damage at all to the plastic lunchbox. This item is nearly irreplaceable (plastic is black, glossy, scratched. circa; 1969)

My preference would be to use latex, but not sure if it will cure on plastic.
Thank you.

Valued Costumer

Answer:

Hi,

Yes, latex will cure on plastic. Have you had any experience in making latex moulds? You need to apply it on in layers and is quite time consuming.

Silicone will also leave the surface undamaged. Both silicone and latex do not require release agents on plastic so both will not do damage to the original item. The only risk you may have if using silicone is if something goes wrong with mixing, for example wrong mixing ratio, not mixed well enough etc. In this case you will have slimy, unset silicone covering your original which can prove difficult to clean. Latex is an air drying product so there is less of a risk of this happening.

Our latex is called Kwik Mold #70

We hope this helps.

Kind regards

Aldax Moulds

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