Polyester Laminating Resin

August 29, 2023 2 min read

Polyester Laminating Resin - TRUE COMPOSITES
Materials Needed:
1. Polyester Laminating Resin (tack-free formulation)
2. MEKP (Methyl Ethyl Ketone Peroxide) or appropriate catalyst
3. Mixing container (preferably disposable)
4. Mixing stick or paddle
5. Fiberglass mat or cloth
6. Rollers or brushes
7. Protective gloves
8. Safety glasses
9. Measuring cups
10. Clean rags or paper towels


1. Safety Precautions:
- Work in a well-ventilated area.
- Always wear safety glasses and protective gloves when handling resins and catalysts.
- Avoid open flames or sparks, as both resin and MEKP are flammable.
- Store the materials in a cool, dry place away from sunlight.

2. Preparing the Surface:
- The surface onto which you're laminating should be clean, dry, and free of any contaminants or grease.
- Lightly sand the surface if it's glossy to ensure better adhesion.

3. Measuring the Resin:
- Measure the required quantity of polyester resin using a measuring cup.

4. Adding the Catalyst:
- For the appropriate catalyst quantity, refer to our MEKP Catalyzation Chart.
- Slowly add the MEKP catalyst to the resin.

5. Mixing:
- Mix the resin and catalyst thoroughly ensuring a homogenous blend without any streaks or undissolved catalyst. Stir gently to avoid introducing air bubbles.

6. Application:
- Lay the fiberglass mat or cloth onto the surface.
- Use a brush or roller to apply the resin mixture onto the fiberglass, ensuring it's fully wetted out. Work from the center outward to push out any air bubbles.
- If applying multiple layers, lay down the next layer of fiberglass and repeat the process until the desired thickness is achieved.
- Use rollers to smooth out the laminate and remove any trapped air.

7. Curing:
- Allow the resin to cure at room temperature. The time it takes to gel and fully cure can vary based on the product formulation and environmental conditions.
- Once cured, the laminate will be tack-free due to the specific formulation of the resin.

8. Trimming and Finishing:
- After the laminate has fully cured, trim any excess fiberglass using scissors or a utility knife.
- The cured laminate can be sanded, painted, or finished as desired.

9. Cleanup:
- While the resin is still wet, tools can be cleaned with acetone or another suitable solvent. After the resin has cured, it will be much harder to remove.
- Dispose of rags, brushes, and mixing containers according to local regulations.

10. Storage:
- Seal any unused resin tightly to avoid contamination.
- Store MEKP or other catalysts in their original containers, securely sealed.