What You’ll Need

• Resin Fibreglass Repair Kit – Complete Polyester Resin and Hardener Set: All-in-one set for structural repair and bonding.
• CROP 2K Fiberglass Putty – 750 ml + Hardener: For filling deep cracks, dents, and bodywork repairs.
• “Abek Climax” – Mask Filters for 755/756/732-A1 – Epoxy Resin Use, Set of 2: To ensure safe breathing during mixing and application.
• Protective gloves and safety goggles
• Stirring sticks, mixing containers, brushes, or rollers
• Sanding paper, cloths, and suitable cleaning supplies

Preparing Your Workspace for Polyester Resin Application

Organise your workspace in advance. Lay out everything you need before you start mixing resin. Place protective covers on your work table, ensure lighting is good, and keep plenty of disposable gloves and paper towels to hand. Open windows or activate extraction to keep air circulating during the entire application process.

Step 1: Ensure a Clean and Ready Surface

Proper surface preparation is the foundation of strong, long-lasting repairs. Begin by thoroughly cleaning the area to remove dirt, oil, or any previous finishes. For fibreglass, grinding or sanding the surface lightly helps the new resin adhere better. On metal, ensure all rust and paint are removed; wipe down with a suitable cleaner to eliminate residue.

Dry the area completely—moisture can compromise resin bonding and curing. Cover surrounding areas to protect from accidental drips or spills.

Step 2: Measure and Mix Your Polyester Resin

Polyester resin requires precise mixing with a specific hardener (catalyst) to start the curing reaction. Measure accurately according to your kit’s instructions—too much or too little hardener can cause improper setting. For example, the Resin Fibreglass Repair Kit – Complete Polyester Resin and Hardener Set includes all components pre-proportioned for easy use.

Always wear gloves, goggles, and a fitted mask with appropriate filters like the “Abek Climax” – Mask Filters for 755/756/732-A1 – Epoxy Resin Use, Set of 2 to protect against fumes. Mix thoroughly in a well-ventilated area, following the mixing ratio and working time indicated on your resin product.

Step 3: Apply the Resin and Reinforcement

Once mixed, polyester resin must be applied promptly. For fibreglass repairs, place the fibreglass mat over the area and saturate it with the mixed resin using a brush or roller, ensuring no air bubbles remain. For filling deeper cracks, holes, or dents—especially in automotive repairs—the CROP 2K Fiberglass Putty – 750 ml + Hardener is ideal. Work in manageable sections to avoid waste, as resin begins to cure quickly once mixed.

For layered laminations, repeat the application as required, allowing each layer to partially cure as recommended in your product’s guidelines.

Step 4: Curing, Finishing, and Safety Cleanup

After application, let the resin or putty cure undisturbed for the recommended time. Allow full curing before sanding, painting, or exposing to water or mechanical stress. Once fully hardened, sand smoothly for finishing. Always collect and dispose of waste resin or contaminated items responsibly, following local regulations.

Store leftover resin, hardener, and tools safely—away from children, open flames, and direct sunlight.

Essential Tips and Common Mistakes

Ensure good ventilation whenever working with polyester resin. Incorrect mixing ratios, insufficient surface preparation, and working in cold or damp conditions commonly cause weak bonds or tacky finishes. Test in a small area if trying a new combination of materials.

If sanding is difficult or sticky, curing may be incomplete—a sign too little hardener was used or the area was not kept at optimal temperature.

Troubleshooting Sticky or Soft Cures

If your repair remains sticky or soft after the recommended curing time, double-check your mix ratio and room temperature. Scrape away uncured resin and clean the area before restarting. Always store leftover resin and hardener in tightly closed containers to avoid moisture contamination.