If you've ever pulled a chocolate, soap, or resin piece out of a silicone mold only to find cracks, air bubbles, or a flat uneven back this tip is for you.
The secret? Always overfill your mold.
It sounds simple, but it's the single most important technique for getting clean, professional results every time and most beginners skip it.
Why Overfilling Works
When you fill a silicone mold to exactly the rim, the material shrinks slightly as it sets, cools, or cures. This shrinkage creates:
- Sunken or concave backs
- Weak edges that crack when demolded
- Air pockets trapped near the surface
By slightly overfilling just a small dome above the rim you give the material room to shrink back to a perfectly flat, solid result.
How Much to Overfill
A good rule of thumb:
- Chocolate & candy: Fill just above the rim, then tap the mold gently on the counter to release air bubbles
- Soap: Overfill by about 2–3mm and smooth with a spatula after 10 minutes as it begins to set
- Resin: Slightly dome above the rim resin shrinks as it cures, so this ensures a flat back
- Candle wax: Always do a second pour to top up after the first pour sinks as it cools
The Tap Method
After filling, always tap your mold firmly on the counter 5–10 times. This brings air bubbles to the surface before they get trapped inside. Combined with overfilling, this gives you flawless results every time.
Demolding Tip
Wait until your creation is fully set before demolding patience is key! Gently flex the mold from the outside and push from the back rather than pulling from the front. This prevents cracking and keeps your piece intact.
Shop our full range of premium silicone molds at AnnLuca — designed for perfect results every time. 🌙 Learn more about our story in our Handmade with Heart post.
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