What You’ll Need

• CROP 2K Fiberglass Putty – 750 ml + Hardener – for filling cracks, dents, and deeper cavities
• Resin Fibreglass Repair Kit – Complete Polyester Resin and Hardener Set – for structural repairs needing extra reinforcement
• “Carbon Resin” – Epoxy Resin for Carbon Fiber & Fiberglass Coating – for excellent fibre integration and a glossy finish
• “FixExpress” – Two-Component Epoxy Glue 500g – for rapid bonding of bumper fragments
• Appropriate abrasive sandpaper (e.g., 80–320 grit)
• Cleaning agent (isopropyl alcohol or degreaser)
• Protective gloves and mask
• Mixing tools and applicators (spatula, brushes)

See the Tools and Materials in Action

View close-ups of the surface preparation, application of putty, and the layering of fibreglass with resin. Notice how each product adapts to the unique contours and needs of a bumper repair project. Quality materials lead to a seamless repair process.

Clean the Damaged Area Thoroughly

Before you begin, it’s vital to remove all dirt, grease, or loose paint from the affected region on the bumper. Use a suitable degreaser or isopropyl alcohol and lint-free cloths. Let the area dry fully before moving to the next step. This ensures that no contaminants will compromise the bond of your repair materials.

Pay extra attention to hidden cracks, as trapped grime could weaken adhesion. Always wear gloves and a mask when working with cleaning chemicals.

Sand and Prepare the Surface

Once clean, sand the damaged area and a margin around it using coarse (80–120 grit) sandpaper. This roughens the surface for better mechanical bonding. Remove any old, loose resin or paint right down to a sound, solid base. If the damage is a crack or hole, bevel its edges slightly to provide more grip for the repair product.

After sanding, clean the area again to clear all sanding dust. For deeper gouges or lost material, preparation is key for a solid repair.

Apply the Chosen Resin Repair Product

Assess the damage: for cracks and small holes, a two-component putty is your best option. The CROP 2K Fiberglass Putty – 750 ml + Hardener is ideal for building up and filling cavities on bodywork, forming a durable base for further finishing. Mix the resin and hardener as directed, then press firmly into gaps, smoothing the surface with a spatula.

If structural reinforcement is needed (such as damage running through the composite), opt for the Resin Fibreglass Repair Kit – Complete Polyester Resin and Hardener Set. This kit includes resin, hardener, and fibreglass matting. Layer pieces of mat soaked in mixed resin over the repair area, pressing out air bubbles gently for perfect adhesion and strength.

For bonding separated fragments or securing small parts, reach for “FixExpress” – Two-Component Epoxy Glue 500g. Its fast cure ensures firm joins with minimal downtime.

Reinforce, Cure, and Finish the Repair

Allow your resin or putty repair to cure fully at room temperature, following the recommended time on your product’s label. Once hardened, sand back any excess to match your original bumper profile, moving to finer grits (220–320) for a smooth finish.

To achieve a durable, even surface—particularly if you’ve used fibreglass or composite cloth—apply a coat of “Carbon Resin” – Epoxy Resin for Carbon Fiber & Fiberglass Coating. This provides further strength, an impact-resistant barrier, and a glossy finish ready for priming and paint.

Ensure all dust is removed before painting. Clean-up of remaining product is best done while uncured, using appropriate solvent or warm soapy water for tools.

Tips and Common Mistakes to Avoid

• Never rush curing times; premature sanding or painting will weaken your bond.
• Always mix resins and hardeners according to the supplied ratios—improper mixing leads to soft spots and failure.
• Work in a well-ventilated area and use protective gloves and a mask when handling resins or sanding dust.
• Test product compatibility if unsure—small test patches reduce the risk of future issues.

Spotlight on Expert Techniques

Watch demonstrations of sanding, mixing, and application methods to avoid air bubbles and achieve a professional-grade finish. The difference lies in careful preparation and thorough curing.