Smooth-On UVO Colorants - UV Resistant Colorants for Epoxy or Urethane Materials - 9 Pack Sampler Tube

I’ve only used two colors so far but they’ve both worked great. I’ve used it with Smooth Cast 305 in small batches of about an ounce total (1/2 oz of A and 1/2 oz of B). I use 2-4 small drops of color mixed into the part B and it gives a very rich color. Once mixed, poured and cured it turns more opaque but I haven’t used it in a super shiny mold yet. I definitely recommend this product as I’ve used other silicone pigments that hardly change the color even using four or more times the amount. It’s more expensive but a little goes a long way and these pigments will last for years.

I was concerned when I first got this. I thought the tubes were so small I wouldn't get much coloring out of them. I was wrong, you only need a drop or two to color the epoxy. I have been very satisfied with the results so far.

I'm guessing this is lifetime supply for most folks. Works very well. I use the pigments to tint clear epoxy.

I've only used the red so far, but as of now I'm happy!

it works beautifully with vacuum and I cast a LOT of stuff :)