The Trickiest Parts of Using Moulds for Bath Bombs and How to Overcome Them

Discover some of our Soakies most common struggles and how you can avoid them

Making bath bombs can be so rewarding, but if you’ve ever struggled with moulds, you’ll know that it’s not always easy! There are a few tricky parts to master, but don’t worry. With a little practice and some helpful tips, you’ll be on your way to bath bomb success. 

Here’s a look at common challenges and how to overcome them.

Mixture Sticking to the Mould

One of the most frustrating parts of using bath bomb moulds is the mixture sticking to the sides when you try to release it. This can leave you with a cracked or damaged bath bomb.

Our 460+ LDPE moulds are an excellent choice for bath bomb making due to their flexibility, durability and, most importantly, non-stick properties. They are also extremely durable, meaning the moulds can be reused multiple times without cracking or wearing down.

Mixture Too Wet or Too Dry

Getting the right mixture consistency is key when using moulds. If it’s too dry, your bath bomb will crumble. If it’s too wet, it may expand in the mould or fizz prematurely.

Aim for a texture like damp sand. If your mixture is too dry, add moisture slowly using a spray bottle and remember that less is more! 

Bath Bombs Cracking After Removal

Even if your bath bomb looks great in the mould, sometimes it can crack or crumble once it’s been released. This often happens when the bomb isn’t packed tightly enough or the pressure is uneven.

Make sure to overfill each half of the mould with mixture and press the halves together firmly but gently. Apply even pressure and avoid twisting, as this can cause cracks.

Difficulty Releasing the Bath Bomb

Getting your bath bomb out of the mould without it breaking can be tricky, especially if the mould is too rigid. Use a flexible mould, such as one made from LDPE, to make releasing the bath bomb easier. 

If you’re using a harder mould, tap the outside gently with a pokey stick before attempting to remove it. Allowing the bomb to rest in the mould for a few minutes before releasing can also help.

Uneven Shapes or Flat Edges

If your bath bombs come out with flat edges or uneven shapes, it’s likely due to improper filling or pressing.

Always overfill the mould so that when you press the two halves together, there’s plenty of mixture to compact into a smooth, round shape. Don’t rush the pressing, take your time to ensure the bomb is evenly shaped.