Collision and Structural
RV Front and Rear Fiberglass Cap Repair and Replacement
Typical range
$750 to $12,000+
Shop hours
4 to 60+
Labor rate
$210/hr
The short answer
Fiberglass cap repair addresses cracks, punctures, and impact damage on molded front and rear caps. Repair runs $750 to $12,000 and up, or 4 to 60 plus hours. Full cap replacement runs $4,500 to $25,000 and up, or 30 to 120 hours at $210 per hour.
01
What this work actually involves
A molded cap is a single large piece of laid-up fiberglass with a gelcoat surface, and it is the part of a coach most likely to take an impact. It is also the part most likely to be repaired badly. A cosmetic fill over a crack that has propagated through the laminate will telegraph back through the paint within a season, usually during the first real heat cycle in July.
Doing it right means grinding the crack out to a taper on both sides of the laminate where access allows, laying up new glass in the correct schedule, fairing it, and then refinishing. On a cap with a graphics scheme, it also means reproducing that scheme, which is frequently a custom paint job rather than a decal because the original decal is no longer available.
Resin selection is not a detail either. Most production caps are laid up in polyester over a chopped strand and mat schedule, and while polyester bonds well to itself it has poor secondary adhesion to a surface loaded with years of wax and migrated mold release. We solvent wash the ground area, abrade it, then wash it again before any resin touches it. On thin sections, and on any cap that flexes in service such as a cab-over bunk, we step the structural plies up to vinyl ester or epoxy, because those tolerate repeated flex cycling on freeway expansion joints far better than a straight polyester layup will.
Whether to repair or replace comes down to how much of the cap is compromised and whether the mounting structure behind it took the hit. We give you both numbers before you decide.
Location: All work is performed at our Yorba Linda facility. We do not offer mobile, roadside, or fleet route service.
02
What the job includes
- Crack, puncture, and impact damage repair on molded front and rear caps
- Full-depth laminate repair with correct glass schedule, not surface filler
- Gelcoat repair, fairing, and surface restoration
- Cap mounting structure and backing repair where the impact carried through
- Full front or rear cap replacement when repair is not the right call
- Headlight, taillight, and marker housing repair and reseal
- Graphics reproduction where the original scheme is discontinued
- Color match and blend into adjacent sidewall panels
- Radiused corner and seam rework where cap meets sidewall
- Cab-over and bunk repair on Class C caps, where flex cracking concentrates
- Core and stiffener rebuild behind the laminate on sandwich-construction caps
- Post-repair seal and water test at every penetration
03
When you need this service
- Any crack in the cap, including hairlines radiating from a mount or a light housing
- A spider pattern in the gelcoat, which indicates the laminate underneath flexed
- A soft or oil-canning area when you press on the cap
- A previous repair that has telegraphed back through the paint
- Water staining on the interior wall behind the cap
- A cap seam that has opened where it meets the sidewall
- A crack that reopens along the identical line every summer no matter how often it is filled
- Star cracking around a screw or bracket where an accessory was mounted through the laminate
04
How we do it, step by step
- 01
Assessment and mapping
Full crack mapping including hairlines that are only visible at an angle, plus a check for laminate separation around the visible damage.
- 02
Backing structure check
We look behind the cap for damage to the mounting structure. Repairing a cap that is bolted to a bent backer means doing it twice.
- 03
Grind out and taper
Damage ground back to sound laminate with a proper taper, from both sides where access allows, so the repair carries load rather than sitting on top of it.
- 04
Contamination removal
Wax, sealant residue, and mold release that has migrated to the surface over years is solvent washed off before abrading and washed again afterward. Abrading a contaminated surface only drives the contamination deeper into the fibers, and nothing bonds to it after that.
- 05
Layup
New glass laid to the correct schedule and resin type for the original laminate, cured under controlled conditions.
- 06
Fairing and gelcoat
Faired to the original contour, which on a molded cap means matching a compound curve rather than a flat plane.
- 07
Refinish and graphics
Color matched, sprayed, blended into adjacent panels, and graphics reproduced where they cross the repair.
- 08
Reseal and water test
Every light, vent, and penetration resealed, then water tested before delivery.
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Pricing and posted rates
| Item | Rate or range | Notes |
|---|---|---|
| Typical job range | $750 to $12,000+ | Varies with extent of damage and parts availability |
| Shop hours | 4 to 60+ | Quoted after teardown, not before |
| Body and paint labor | $210 per hour | 2026 posted rate |
| Paint supplies | $55 per paint hour | Calculated automatically on every estimate |
| Body supplies | $5 per body hour | Calculated automatically on every estimate |
| Parts | 100% markup under $100, 35% over | Special order parts require a non refundable deposit at order |
| Deposit | 50% at authorization over $2,000 | Additional 25% when parts arrive on jobs over $10,000 |
| Sales tax | 7.75% on parts and materials | Labor is not taxed |
Insurance billed jobs may be billed at carrier negotiated labor rates that differ from the posted retail rates above. See all posted rates.
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Vehicles we do this work on
Vehicle
Class A Gas Motorhomes
A Class A gas motorhome is a flat-front coach built on a Ford F53 or Workhorse front-engine chassis, typically 28 to 38 feet. Rear
Vehicle
Class A Diesel Pusher Motorhomes
A diesel pusher carries a rear-mounted diesel on a raised-rail air ride chassis, usually 34 to 45 feet with full-body paint and pa
Vehicle
Class C Motorhomes
A Class C is a coach body built onto a cutaway van chassis with a sleeping or storage cabover extending above the factory cab. Tha
Vehicle
Standard Fifth Wheels
A fifth wheel couples to a hitch in the truck bed through a kingpin and pin box, with a raised forward bedroom over the truck. The
Vehicle
Travel Trailers
A travel trailer tows from a ball hitch behind the tow vehicle rear axle on an A-frame tongue, which makes it the most sway-prone
Vehicle
Teardrop Trailers
A teardrop is a small monocoque sleeping trailer, usually 4 to 6 feet wide, with a rear galley under a lifting hatch. The hatch se
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Questions about fiberglass cap repair
Frequently asked questions
How much does fiberglass repair cost on an RV?
Cap repair runs $750 to $12,000 and up, or 4 to 60 plus hours at $210 per hour plus materials. A single contained crack with no graphics crossing it is at the low end. A cracked cap with a multi-color graphics scheme that has to be reproduced is at the high end, because the paint work exceeds the glass work.
Should I repair or replace a damaged cap?
Repair when the damage is contained and the mounting structure is sound. Replace when the laminate is compromised across a large area, when there are multiple separate impact points, or when the cap has already been repaired badly and the previous work has to come out anyway. We price both and give you the comparison.
Why did my last fiberglass repair crack again?
Almost always because it was filled rather than laminated. Body filler over a crack has no tensile strength across the joint, so the first heat cycle or road flex opens it again along the same line. A correct repair grinds the damage out to a taper and lays in new glass so the repair carries load.
Can you match my RV graphics?
Yes. Most factory graphics schemes older than a few years are discontinued as decals, so we reproduce them in paint. That is more labor than a decal but it holds up far better in Southern California sun, and it is often the only option available.
Does insurance cover fiberglass cap damage?
Impact damage is generally covered under collision or comprehensive depending on how it happened. Gradual deterioration such as UV chalking or age-related crazing is generally not. We document the difference clearly, because a cap can have both and only one side of it is claimable.
Does the cap have to come off the vehicle to be repaired?
Most work is done with the cap in place. Removal is warranted when damage runs into the mounting flange, when the backing structure behind it needs attention, or when the crack requires access to the inside face for a two-sided taper. Taking one off means dealing with the windshield or rear window, marker lights, wiring, and the sealant bed at the sidewall joint, so it roughly doubles the labor. We make that call after mapping and explain which one your cap needs.
How does Southern California weather affect a molded cap?
Sun does most of it here. A dark graphics panel on a front cap parked in Palm Desert or Coachella reaches surface temperatures far above ambient, and the daily expansion and contraction cycle works any existing crack a little further open every day. Coastal units in Oceanside and Long Beach see less thermal swing, but the salt film holds moisture against exposed laminate edges. High desert owners in Hesperia and Lancaster deal with hail, which puts crushed impact points into a cap already made brittle by years of UV.
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Ready to move on fiberglass cap repair? Bring it to Yorba Linda.