8 Soap Making Myths

There’s a lot of information out there about soap making—and not all of it is good.

I’ve seen beginners get frustrated, waste ingredients, or think they’re doing something wrong… when really, they were just following bad advice.

So let’s clear up a few of the big ones.

Myth #1: You Can Make Soap Without Lye

This one comes up constantly.

You cannot make real soap without lye. It just doesn’t work.

Soap = fats + lye. That’s the chemical reaction that turns oils into soap.

Now, if you’re using melt and pour, the lye has already been used in that process—but it was still there unless it is a completely detergent based bar.

I’ve seen people try to avoid lye completely and end up with oily bars that never set properly. I've had someone tell me that their soap has no lye in it and that it's 100% glycerin and that would just be a liquid if it were true.

If you’re making cold process soap, you are using lye. The key is learning how to use it safely.

Myth #2: More Oils = Better Soap

I get why people think this. It feels like adding more “good stuff” should make a better bar.

But in reality, it usually just makes things more complicated. I’ve seen recipes with 8–10 oils that don’t perform any better than a simple 4-oil recipe.

What actually matters is balance:

• Hardness
• Lather
• Conditioning

You don’t need a long ingredient list to get that.

Personally, I recommend starting with 3–5 oils max so you can actually learn what each one does.

Myth #3: You Don’t Need to Double Check Lye Amounts

This is one I see a lot with recipes pulled from random blogs or AI.  Even if you trust the source—check it anyway.  I’ve looked at plenty of recipes where the numbers were just… wrong.

Soap making is a chemical reaction. If your lye is off, your soap will be off.

• Too much → harsh, unsafe
• Too little → soft, oily

Always run your recipe through a lye calculator. Every time.

Myth #4: Coconut Oil Makes the Best Soap

Coconut oil makes great bubbles—no argument there, but I’ve seen a lot of beginners go heavy on it thinking more = better.  Too much coconut oil can be really drying.

Yes, 100% coconut oil soaps exist—but they’re usually:

• Superfatted very high (20%+)
• Still not for everyone

I’ve even seen people say those bars feel both drying and greasy at the same time.

Keep coconut oil in that 15–30% range unless you really understand how to adjust for it.

Myth #5: If It’s Hard, It’s Ready to Use

This one gets people every time. Just because your soap is hard enough to unmold doesn’t mean it’s ready. Curing does a lot more than just “drying”:

• Water evaporates
• Bar gets harder
• Lather improves
• Mildness improves

We cure ours at least 4 weeks, and honestly, some batches get longer. I’ve had soaps that were okay at 4 weeks and great at 6+.

 Give it time. It makes a difference.

Myth #6: Fragrance Oils Are All Easy to Work With

I wish this were true. Some fragrances behave beautifully. Others will fight you the entire time.

I’ve seen fragrances:

• Accelerate so fast you can barely pour
• Seize the entire batch
• Discolor more than expected
  

Sometimes they’re technically “soap safe” but still not practical to use.  One thing I personally assume- Florals and spices are going to accelerate.  Because a lot of times, they do.

So I plan for it:

• Soap a little cooler
• Keep designs simple
• Move quickly

Myth #7: You Can Swap Oils Without Recalculating

This is not optional. Every oil has a different SAP value, which means it needs a different amount of lye. 

Even a small change requires recalculating.

I’ve seen people swap one oil and end up with a batch that never sets right—or worse, isn’t safe.

If you change anything in your oils, you run it through a calculator again. No shortcuts here.

Myth #8: You’ll Get It Right on the First Try

I don’t say this to discourage you—just to set expectations.

Most people don’t nail everything on their first batch.

You might have:

• A weird trace
• A bar that’s softer than expected
• A scent that didn’t behave

That’s normal. I’ve made plenty of batches that didn’t go the way I planned. You learn something every time.

The goal isn’t perfection—it’s understanding what happened and adjusting.

Final Thoughts

A lot of soap making frustration comes from believing things that just aren’t accurate.

If you stick to:

• Balanced recipes
• Accurate measurements
• Simple formulas

You’ll avoid most of these issues before they even start. Honestly, once you understand the “why” behind things, soap making gets a whole lot less confusing.