Can You Repair Fibreglass After a Lightning Strike?

Assessing Lightning Damage on Fibreglass

After a lightning strike, the type and extent of fibreglass damage can range from minor surface cracks to more significant structural weakening. Typical signs include blistering, burnt patches, delamination, or deep cracks near points of entry or exit. It’s essential to inspect both visible surfaces and the underlying structure to determine which areas need attention. In serious cases, you may need a professional surveyor, but superficial and moderate repairs are often manageable for skilled and DIY users.

Repair Approaches and Recommended Materials

For minor damage or cracks, fibreglass repair kits like the Resin Fibreglass Repair Kit – Complete Polyester Resin and Hardener Set are a practical solution. These contain everything required for patching, laminating, or reinforcing affected areas with a fibreglass mat and waterproof polyester resin. For deep chips or filling tasks, consider a fibreglass-reinforced putty such as CROP 2K Fiberglass Putty that offers strength and easy sanding.

Where restoring gloss or ensuring strong adhesion is needed, a dedicated epoxy resin like “Carbon Resin” Epoxy provides excellent durability and finish. Just ensure surfaces are prepped and cleaned before application, and always follow kit instructions for the best results.

When This Matters Most

Quick and reliable fibreglass repair becomes essential if the lightning strike has left your boat exposed to water ingress or weakened structural areas. Timely action helps prevent further deterioration and maintains vessel safety—especially if you plan to get back on the water soon.