How fiberglass RVs are repaired after impact

Fiberglass RVs respond to impacts differently than metal vehicles, and knowing the right repair steps prevents small damage from becoming structural or water-intrusion problems. Motor City Truck Collision explains how technicians inspect, diagnose, and repair fiberglass damage after an impact.

This guide covers what to look for, the repair techniques commonly used on motorhomes and travel trailers, and practical advice to keep your RV safe and roadworthy. The goal is clear: restore strength, stop leaks, and match the finish for long-term reliability.

Understanding the Issue

Fiberglass RVs are built from gelcoat, fiberglass cloth or mat, and interior core materials. An impact can crack the gelcoat, tear or delaminate the fiberglass layers, or crush the core (wood, foam, or composite). Cosmetic chips may remain surface-level, but impacts that break underlying fiberglass or saturate the core invite water intrusion, rot, and structural weakening. Examples include a low-clearance scrape that removes gelcoat and tears backing layers, a storm-borne branch puncturing a sidewall, or a backing impact that stresses roof joints and seals.

Common Causes or Warning Signs

Common causes of fiberglass damage include collisions with low overhangs, tree branches, parking lot impacts, and road debris. Warning signs to catch early are hairline cracks in the gelcoat, soft or spongy spots on walls or the roof, bubbling paint or blistering finishes, visible separation at seams, fresh stains inside cabinets or around trim, and new or worsening leaks after rain. An unexpected sag in a roof panel or an outline of moisture under interior trim are indicators of core saturation that require prompt attention.

How Motor City Truck Collision Approaches This Issue

Motor City Truck Collision begins with a careful, documented inspection that looks for surface and hidden damage. Technicians test for moisture, assess core integrity, and determine whether the repair is cosmetic or structural. Repair steps typically include removing contaminated materials, grinding back damaged gelcoat and fiberglass to solid laminate, replacing or reinforcing core sections, and performing proper fiberglass layups with compatible resins and cloth. After curing, the surface is faired, primed, and color-matched using industry-appropriate coatings. Final checks include leak testing, seam inspection, and a quality review to ensure repairs stop water intrusion and restore strength.

Prevention Tips or Best Practices

Inspect your RV regularly, focusing on the roof, seams, trim, and areas near vents and windows. Address chips and scratches quickly to prevent moisture entry. Avoid low clearances and overhanging branches when parking or traveling. Keep roof seals and seams maintained—replace sealant at first signs of cracking. Wash the undercarriage and exterior regularly to remove road salt during Michigan winters, and store the RV under cover or use breathable covers when possible. Train drivers to back and maneuver with extra clearance and document any impacts so repairs can be prioritized before they worsen.

Need Help With This Issue

Prefer to speak with a technician? Use the contact link above to request an inspection or get a repair estimate. Motor City Truck Collision provides documented inspections and moisture testing for fiberglass RV repairs.