Rainbow resin is made by mixing and tinting resin in multiple colors, then layering or swirling those colors in a mold before the resin cures. The key is controlling timing: pour when the resin is thick enough to hold distinct bands, or pour sooner for softer blends. Safety and accurate measuring matter just as much as color technique, since resin only cures properly when the ratio and mixing are correct.
Use a quality epoxy resin (or UV resin for small, fast projects), mixing cups, stir sticks, nitrile gloves, and a level workspace. For color, mica powders, resin dyes, or alcohol inks work well; choose pigments labeled resin-safe. Have your mold ready (silicone is easiest), plus a heat gun or small torch to pop surface bubbles.
Start by protecting your surface and ventilating the area. Measure resin and hardener precisely per the manufacturer’s instructions, then mix slowly but thoroughly, scraping the sides and bottom. Divide the mixed resin into separate cups—one for each rainbow color—and tint each cup a little at a time until you like the saturation.
Let the cups sit until the resin reaches a “honey-like” consistency (this reduces muddy blending). Pour the first color into the mold, then pour the next color gently against the side or over a spatula to create cleaner layers. Repeat until the mold is filled. Lightly pass a heat gun over the surface to release bubbles, then cover to keep dust off and allow it to cure undisturbed.
If you prefer marbled, tie-dye effects, pour your colors while the resin is still more fluid. Add colors in alternating spots, then use a toothpick or skewer to drag gentle S-curves through the resin. Stop early—overmixing turns rainbows into one flat tone.
For extra tips on color order, timing, and finishing, follow the full tutorial here: https://ultimatechoicespoint.shop/how-to-make-rainbow-resin/.
Colors usually get muddy when they’re swirled too much or poured while the resin is very thin. Wait for a thicker stage before layering, and limit how many passes you make with a stirring tool.
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