Rainbow resin tutorial – How to make rainbow pendants with resin

Rainbow resin pendants

Originally posted October 2017.  Updated February 2019.

It was all rainbows and unicorns in the studio this week.  Okay, maybe not the unicorns.  Wouldn’t that have been cool!  I love creating rainbow charms with resin, but wanted to do something different this week.  I thought it would be fun to create them with different layers of resin and show you how in this rainbow resin tutorial.

clear resin and clear silicone molds resin supples

coloring resin

Step 2

I colored the resin with the Resin Obsession transparent resin pigments.  Once they were colored, I added a teensy bit of the Resin Obsession pearl powder.

Pro tip:  In general, a little of these powders go a long way.  Start with less than what you think you need, then add more as necessary.

casting resin in a silicone mold

Step 3

Pouring the resin got to be a bit tedious.  No matter how hard I tried, the resin was ‘attracted’ to the sides of the mold.

filling a clear silicone mold with resin

The longer I waited, the resin eventually made its way to the bottom of the mold.  I filled each mold a third to halfway full.

Not shown:  I used a toothpick to gently remove the remaining resin drips from the inside of the mold before pouring the next layer.

pouring a second colored layer of resin into a clear silicone mold

Step 4

Because I wanted a very ‘fluid’ look to my pendants, I poured the next layer of resin while the first layer was still liquid.  This allowed it to blend a bit and have a wavy line junction where the two layers meet.  If you want solid, distinct layers for your pendants, allow one layer to be (at least) almost fully cured before pouring the next layer.

clear silicone molds with resin

I filled the molds and added a third color to the larger rectangular ones.

Not shown:  I demolded the resin charms the next day after the resin fully cured.  It can be a bit tedious to demold these, so here is how I like to do it:

rough edge on a resin charm

Step 5

Because resin always shrinks a little bit when it cures, I try to overfill the molds a smidge to account for this.  This one fell short, so I sanded off the end with wet/dry sandpaper to make it smooth.

adding a screw eye to a resin charm

Step 6

I used my flex shaft and a #64 drill bit to drill a hole in the top center of each resin pendant.  Mark with a sharpie first to help direct you where to drill.  A silver screw eye was inserted in the hole.

Pro tip:  You want the hole you drill to be a little smaller than the screw eye.  This will ensure it grabs into the side of the hole when it is placed in the resin charm.  For a stronger hold, you can use a dot of mixed resin or E6000 in the hole when placing the screw eye.

how to make rainbow resin necklaces

Step 7

I added 20 gauge jump rings to the screw eye fasteners and hung the pendants on silver ball chain necklaces.  I love the range of colors and how they look fluid in the pendants.  It creates a look of active movement.

Like this post? You may be interested in  How to make a resin bangle bracelet

rainbow resin pendants detail

I love the shimmer the pearl powder adds to the colored resin.  I don’t think you could get the same effect with transparent resin only.

pink and purple resin pendant

Of all of my rainbow resin pendants, this one is my favorite.  I like it even better in the direct sunshine!

Which one of these rainbow resin tutorial pendants is your favorite?

Unpublished Blog Posts of Resin Obsession, LLC © 2019 Resin Obsession, LLC


Teresa Ross

Whenever I pour one color over another color the two color merge into one. Do you think it is the resin or the colorant that I am using? I love the fluidity of your colors.

Katherine Swift

If you don’t want the colors to blend, let them cure first. You will have more distinct layers and the colors won’t blend at the seams.

Andy Slater

Hope Katherine won’t mind me butting in but there are other potential issues and solutions.

First, and fairly obvious is that the upper layers need to be poured very gently so as to sit on top of the lower layers. Try pouring using a stick such that you pour onto the stick, the resin runs down it, and hits the surface of the already poured resin with minimal force. When making Irish coffee they pour the cream onto/over a spoon. 😉

The second issue is density/viscosity. If you pour a denser liquid on top of a less dense one, it’s going to want to sink (and mix while doing so).

What resins and pigments you use can be an issue. I suspect that Katherine’s choice of products is “fortunate” if not actually “by design”. If you are using other products that could be your problem.

A really important point to note however is that Katherine mixes all of her clear resin as a single batch before splitting it into small portions to add pigment. This means that at the very least her mix of resin and harder is consistent throughout the entire project. Mixing individual portions of resin and hardener would be less reliable.

One final note: this technique is going to work more reliably using small moulds with a small surface area (less area/weight to break through). Making Irish coffee is difficult enough in a wine glass. Making it in a bath tub would be extremely difficult… but I’m up for trying. 😉

Angela Thoma

Thank you for the tutorial and the video to unmold them. I destroyed my first mold trying to get the resin trinket out.

Susana Salazar

En el lugar en el que vivo no encuentro moldes (vivo en Isla de Pascua) .
Cómo puedo confeccionar los moldes para mis resinas? Qué será más conveniente?
Saludos y gracias

Karen Cabrera

I want to make these clear and then add a bit of color to the clear to give it the effect of the color swirling or drifting around in the clear. Like what coffee looks like when you add creamer. I have seen them somewhere with a tutorial but of course can’t find it now. If anyone can help I would really appreciate it. TIA.


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