Two common DIY methods for repairing cracked solar panels are covering the panel with a laminating film and applying polyurethane. The laminating film method involves spreading a transparent, waterproof film over the cracked panel and using a heat gun to fuse it to the surface. Severe damage requires professional replacement. However, in the case of cracked solar panels, the cracks can provide a potential entry point for moisture to seep through the minute fractures and into the solar panels where it can damage and destroy your. Meta Description: Discover why waterproofing photovoltaic panel gaps matters, how to do it safely, and industry-approved methods. You know, solar panels are built to withstand rain, right? Well, here's the catch: micro-gaps between. Microcracks are the most common damage to solar panels. Repairing Small Cracks: For small cracks on the surface, you can use waterproof epoxy resin to seal the crack, preventing moisture from entering and worsening the damage.