[Aerodyne]

Certainly a good result, John, but at a cost. Up to the individual to decide. My method was 'cheap and cheerful'. Alginate is completely harmless, doesn't require a two-part approach, works with normal tap water and doesn't tend to cause air bubbles. As for resin, I used Auto body (for fibreglassing) liquid resin, bought from auto accessory shops.

Not too many of us have access to a vacuum chamber but one is essential to be certain to prevent air bubbles. They are used commercially.

For the tinting, as I suggested in the video, a very small quantity of ordinary paint - or aerosol paint, added quickly - served me well enough.
I have used other methods over the years but all were more expensive and/or trickier to do than the simple Alginate.

Tony