Choosing the right adhesive
Saregum vs. Ecostic 1816B vs. Aquilim 315 vs. Ecostic 1804: Choosing the Right Leathercraft Adhesive
Why the Right Adhesive Matters
In leathercraft, choosing the right adhesive is just as important as selecting the best leather and stitching technique. The glue you use affects durability, flexibility, and heat resistance.
At Lunar, we prioritize materials that enhance longevity, ensuring every piece stands the test of time. In this guide, we’ll compare Saregum, Ecostic 1816B, Aquilim 315, and Ecostic 1804 to help you select the best adhesive for your leatherwork.
Understanding the Differences
| Adhesive | Base | Key Strengths | Best Use Cases |
|---|---|---|---|
| Saregum | Natural Rubber | High flexibility, strong bond, longer drying time | Soft leather goods, watch straps, flexible applications |
| Ecostic 1816B | Polychloroprene (Neoprene) | Strong initial tack, high heat resistance, fast drying | Structured leather goods, wallets, belts, shoes |
| Aquilim 315 | Polyurethane (PU) | Flexible, durable, softer bond, resists cracking | Watch straps, bags, softer leather applications |
| Ecostic 1804 | Polychloroprene (Neoprene) | Longer open time, high bond strength, strong adhesion | Similar to 1816B but allows more adjustment time |
1. Strength & Bonding Performance
- Saregum – Strong yet highly flexible, making it ideal for watch straps, soft leather goods, and applications where flexibility is needed.
- Ecostic 1816B – Provides a rigid, structured bond with a fast initial grab. Perfect for wallets, belts, and structured goods.
- Aquilim 315 – Offers a soft, elastic bond, best for bags, straps, and flexible leather applications.
- Ecostic 1804 – Similar to 1816B but has longer open time, allowing for adjustments before bonding fully.
Which to Use?
- ✔ For soft and flexible leather goods → Choose Saregum or Aquilim 315
- ✔ For structured wallets, belts, and high durability → Choose Ecostic 1816B
- ✔ For strong adhesion but with more open time for adjustments → Choose Ecostic 1804
2. Heat Resistance
| Adhesive | Heat Resistance |
|---|---|
| Saregum | Moderate – Works well for flexible goods, but not for high-heat applications |
| Ecostic 1816B | High – Best for belts, wallets, and structured goods |
| Aquilim 315 | Low – More focused on flexibility than heat resistance |
| Ecostic 1804 | High – Similar to 1816B but with longer workability |
3. Workability & Open Time
| Adhesive | Drying Time & Open Time |
|---|---|
| Saregum | Longer drying time – Allows for repositioning before bonding |
| Ecostic 1816B | Fast-drying – Strong initial tack, little time for adjustments |
| Aquilim 315 | Slower drying – More open time, easier repositioning |
| Ecostic 1804 | Extended open time – More workability before setting |
4. Best Uses for Each Adhesive
| Project Type | Best Adhesive Choice |
|---|---|
| Wallets & Small Goods | Ecostic 1816B or 1804 for structured wallets, Saregum or Aquilim 315 for softer styles |
| Watch Straps | Saregum or Aquilim 315 (flexibility matters) |
| Bags & Accessories | Saregum or Aquilim 315 (for softness), Ecostic 1804 (for structure) |
| Belts & Shoes | Ecostic 1816B or 1804 (strong hold, high durability) |
Final Thoughts
At Lunar, we believe that even the smallest details—like the adhesive used—play a huge role in the final quality of a product. Whether you're crafting structured wallets, flexible watch straps, or durable belts, choosing the right glue will ensure your work stands the test of time.
Want More Leathercraft Insights?
Check out our Craftsman’s Corner for expert guides, tool breakdowns, and more tips to refine your craft.
Written by Dustin Curtis
