How To Pour Resin Into Molds

How To Pour Resin Into Molds

If you have decided to start working with epoxy resin, then you have landed on the right page. Resin casting can be a fun and relaxing activity. Not to mention the feelings you get when you finish a DIY project and everyone admires it. 

I still remember my first piece of art, a necklace with a red carnation embedded inside. Later on, I gave it as a gift to my mother. Not only was she impressed, but she also encouraged me to keep up with my new passion. 

From the very first beginning, I wanted to create something unique. Truth be told… I failed! And not only once, but three times. And that was because I couldn’t find the correct information about everything it means to work with epoxy resin. That’s why I decided to share with you guys some tips & tricks on how to pour the resin into molds. Let’s get started!

How to pour resin into molds

Types of resin molds

When choosing molds, you always have to think about the process of pouring the resin into the molds. The mold must be stable so it can hold the weight of the resin.

  • Dimensional molds. These are specially made to create 3D objects, such as chess pieces, star shaped pendant, bangles, or coasters. 
  • Silicone molds. Made from two-part silicone, these types of molds are reusable and can last for many years. They are super flexible, allowing you to do complex castings that can be removed easily compared to plastic molds. However, they could be a bit expensive, and they require more care. If you’re thinking about using latex molds, make sure you clean them immediately after use and store them in a cool, dry area. 
  • Plastic molds. Partially flexible, these resin casting molds can also be reused. They are usually made from polypropylene or polyethylene sheet plastic and are somewhat flexible. Plastic molds are low-price and easy to work with, which makes them the perfect choice for newbies. 
  • Home molds. Almost any object from your home can be transformed into a resin mold, from ice cube trays, chocolate boxes, or glass jars, to plastic lunch containers and cookie cutters.
House molds

How to make resin molds at home

There are so many sizes and types of molds you can choose from to suit your project. But, if you want to get more creative, you can make your own molds right at home. Before starting, you need to ensure you have all the necessary materials. These include:

  • Casting resin
  • Mold putty
  • Cups for mixing
  • Rubber gloves
  • The item that you want to replicate
  • Razor blade
  • A timer
  • Mold release

Molds made with liquid silicone

There are two methods of DIY mold making with liquid silicone:

1. Using a silicone mold-making kit. It comes with two components that need to be mixed at a 1-to-1 ratio. 

  • Pour equal units of parts A & B into a plastic cup and mix thoroughly for five minutes.
  • Place the object you want to replicate into a non-silicone container with enough space for the mixture to cover it. 
  • Use a dust cover to protect the piece and let it cure for about 6 hours at room temperature. 
  • Once cured, carefully remove the item from the mold.
  • The mold itself is ready for casting.

Tip: Use a mold release to avoid binding the object and to separate it easily.

Molds made with liquid silicone

2. Using tubes of silicone chalks. If you choose this method, the items you need are: a bowl of water with liquid soap (1 part soap and 10 parts water) and the item you want to reproduce. 

  • Squeeze the silicone chalk into the bowl of water so that the object you want to transform into a mold will be covered. 
  • Put on your rubber gloves, take the silicone out of the water, and shape it into a ball.
  • Knead the silicone as one would knead bread dough until it’s no longer sticky.
  • When it begins to harden, it’s time to mold around the item you want to use to create the mold.

Let it cure for about one or two hours. When the mold no longer feels tacky to the touch, it’s time to remove the positive item.

Molds made with silicone putty

Silicone rubber mold putty contains a two-part kit with two types of putties that are combined in a 1:1 ratio. Here’s how you can make a mold using silicone
putty.
  • Mix equal amounts of both putties until the two colors are thoroughly combined.
  • Carefully form the putty around the item to be transformed into a mold.
  • To obtain total hardness, let it cure for 24 hours. 

Tip: You can also heat-cure the mold in an oven at 350-degree F for a half hour.

Now that you know everything about molds and how to make them, it’s time to get a little information about the basic types of resins.  

Types of resins

  • Polyester resin. This resin is durable and used for industrial applications or by experienced craftsmen to carry out extremely detailed projects. It’s durable, although highly toxic and should be used in a well-ventilated area, using protective masks, gloves, and goggles.  
     
  • Epoxy resin. Perfect for jewelry casting, making coasters, ashtrays, ornaments, or even paint pouring art, epoxy resin is easy to use and cures quickly, thanks to the shallow setting depth. It comes in two parts, resin and hardener, which must be mixed in the ratio indicated by the manufacturer’s instructions. For example, Roxy Epoxy has a 1:1 ratio of hardener and resin. It’s easy to mix, self-levels, and gives a glass-like finish to your projects. It’s also a good choice if you’re a beginner who has just entered the world of epoxy enthusiasts. 
  • Working with epoxy resin is not only about choosing the right molds and products. When you want to create a project, you also have to think about colors.

    Bring your works of art to life with this mica powder kit that contains 24 unique
    vibrant colors!

    How to pour resin in a mold

    Regardless of the type of project you want to make, there are some basic tools
    you’ll need.
    • Silicone resin molds
    • Resin and hardener
    • Gloves
    • Wooden sticks
    • Graduated measuring cups
    • Mica powder or glow in the dark pigments
    • Dust cover (to protect molds)
    • Wax paper
    • Hairdryer 

    Step 1: Prepare the molds and the working area.

    Cover the workspace with wax paper so resin doesn’t stick to it. Wash the silicone molds with water (it needs proper washing as silicone is a material that gathers a lot of dust and other particles). Leave them to dry on a napkin. Also, make sure the room you’re working in is well-ventilated, and always wear a mask, goggles, and gloves. 

    Step 2: Start mixing.

    Measure equal parts of resin and hardener (as indicated by the manufacturer) in the measuring cups and mix them with a clean stir stick. The mixing time required may differ from brand to brand. That’s why it’s essential to read all the instructions carefully on the label. At this stage, you can also incorporate the pigments. You can choose to add one, two, or even more colors. The secret to obtaining a striking color is to stir until the dyes are fully dissolved.

    Step 3: Pour the composition into the molds.

    With the wooden stick, scrape the resin into the molds and don’t hesitate to apply a second or subsequent layer of epoxy until the casting reaches your desired volume. In order to avoid sanding between pours, subsequent pours must be applied when the previous ones have cured to a tacky stage. Let it harden perfectly before adding or sanding the topcoat. 

    Step 4. Pop out your works of art.

    Peel the mold away carefully. Don’t use anything sharp because it might scratch
    your object. If the resin gets stuck to the mold, the right thing to do is to use a mold release agent.

    Step 5. Wash your mold.

    The better you take care of your molds, the longer they will last. After each use,
    the molds must be cleaned with water and soap and stored away from heat and
    sunlight.

    How to remove air bubbles.

    I know this is an unpleasant situation, but it can happen. I’ve been there several
    times and I always used a hairdryer. Thanks to my hairdryer, I’ve managed to save so many projects. Another way to get rid of air bubbles in epoxy resin is to use a hot air gun or a torch directly above them. It’s important to eliminate them immediately after you pour the resin, otherwise, they’ll cure into your artwork.

    Wrap up

    Creating DIY epoxy resin projects is fun and so rewarding. Even if it may seem
    a bit difficult, especially at the beginning, you’ll become addicted to this hobby.
    It’s a great way to express, unleash your inner artist, and create meaningful items.
    Follow these steps on how to pour resin into molds and get creating today!