2025
Posted by Sika Expert
DIY Halloween Molds
Get ready to have some Halloween fun with this DIY mold-making project using Sikaflex® Hybrid Self-Leveling Sealant! The freedom is completely yours to create spooky, reusable molds of bats, skulls, pumpkins and much more.
Safe to display inside or outside your home, this family-friendly project is sure to give your Halloween decor an eerily personal touch this season.
The size and number of the molds used will affect the size of the finished product and the number of cartridges required to complete this project.
Supplies & Tools
- Sikaflex® Hybrid Self-Leveling Sealant cartridges*
- Safety gloves
- Safety glasses
- Retractable safety knife
*Product cartridges required for this project may vary depending on the size & number of molds used
- Halloween-style silicone molds
- Standard 10 oz. caulking gun with seal puncture tool
- Scissors
- Paper towels
Step 1: Gather All Your Supplies
Before getting started, gather all the supplies you’ll need (listed above). Be sure to wear gloves and safety glasses for protection. These DIY molds were inspired by the creativity of DIY content creators, and we’re excited to share our own version - crafted using our very own products.
Step 2: Cut the Tip of the Cartridge & Puncture Inside Seal
Use the knife to cut the tip of the nozzle at a 45° angle. Then, puncture the seal on the inside of the nozzle.
Step 3: Place Cartridge Into a Caulking Gun
Step 4: Gun Sealant Into the Molds
Hold the gun at a 45° angle and squeeze the gun handle to start the flow of sealant. Completely fill each space within the mold. Product will level itself, no tooling is required. To stop the flow of sealant, release the pressure bar on the caulking gun and begin to slowly move the cartridge away from application area.
Step 5: Allow Time For Sealant to Fully Cure
Allow time for the sealant to fully cure in a safe and dry place. This product has a fast skin time but may take up to 3-5 days (72-120 hours) to fully cure and become ready for removal from the molds. Cure time can vary based on factors like temperature and humidity. Check all the way through the molds to ensure a full cure.
Step 6: Pull Sealant From Molds
Once fully cured, pull the sealant from the molds. Optional – use a scissor to cut away any excess sealant.
Step 7: Decorate Your Home
Customize and decorate to your desire. Place finished molds anywhere around your home, indoors or outdoors!
Want to customize your molds? Bring your vision to life and create molds of all different colors to suit your space with our other available Sikaflex® sealants!