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Is the moulding material safe for my skin?

Our moulding gel is a seaweed-based material called Alginate. This is non-toxic, biodegradable and safe for skin, including for babies. Our brand of Alginate is used every day by the casting artists at Mills and Mills. It is specially formulated to create amazingly detailed, high quality body castings whilst being gentle and safe.

What else do I need with the kits?

Depending on the kit type, we usually recommend having a mixing bowl, baby oil and scissors to hand. Any other extra items will be easy to find around the home, and are listed in the kit instructions and on the product page before purchase.

How do I get the most working time with the moulding material?

Alginate sets quickly, which is perfect for working with young children. If you need a little more working time, you can use cooler water (temperature guides are provided in your kit instructions booklet). Warmer water will make the alginate set quicker.  If you don't have a thermometer handy, just use cool water.

Is the mould reusable?

Only one casting can be made from each mould taken. Casting stone is poured into each mould, and these moulds are then carefully peeled away to reveal your stone casting inside. This means the mould is unusable once removed, but it means every casting is totally original!

How do I paint my Casting?

Your casting will dry to a white finish. If you would like to paint your casting, it is essential to ensure it is dry. Leave for at least two weeks before painting.


We recommend using acrylic paints on your stone casting, as these are easy to apply at home, are usually water based and so are safe to use. They come in a variety of metallic colours, and can be found both at local art shops, as well as large supermarkets. We have these availble in our store.

Spray Paints

You can alternatively use spray paints, however due to the ease of drips and also the fumes, we do not like to recommend them as our first choice. 

What if I make a mistake?

Our guidebook is written by the professional casters and creators of Mills and Mills. They have included simple step-by-step instructions with illustrations at each stage. If you follow this guide, you're sure to make a great casting.