A hole in a wall that looked like a scuff

From the far side of a parking space this was a scuff on a lower panel. Up close it was a hole through the wall, with the foam core open to the weather.

What is actually in an RV sidewall

This is the part that makes fiberglass damage different from a dent in a car, and it is worth understanding before anyone quotes you.

A modern laminated RV sidewall is a sandwich. Outside there is a thin fiberglass skin with the finish on it. Behind that is a core — foam block or, on older and cheaper builds, a lauan plywood layer. Behind that is the framing, and then the interior wall. The whole thing is bonded together under pressure, and it gets its strength from being bonded, not from any one layer.

That has one consequence that matters enormously: the outer skin is not a cosmetic surface. It is the weather seal for the core. Once it is breached, water gets into the core and travels sideways along the bond line, well past anything you can see. The panel delaminates progressively — the skin separates from the core — and what was a panel repair becomes a wall rebuild.

That is the whole reason we push people not to leave this over a winter.

Why this one looked minor

Impact damage low on a sidewall usually does. The trim and the lower skirt hide the extent of it, the eye reads the dark band as shadow, and from any normal viewing distance it reads as a mark rather than an opening. The third photograph below is the honest one — it is what an owner sees walking up to their own rig, and it is why this sort of damage sits unrepaired for a season.

The repair, in order

Structure first, cosmetics second

There is a cheaper version of this job. You clean the edges, pack the void with filler, sand it flat, and spray it. It looks identical on the day.

It fails because filler is not a structural material. It has no tensile strength, it does not bond to the foam core in any meaningful way, and it moves at a different rate from the fiberglass around it as the panel heats and cools. On a wall that flexes every mile you tow it, the repair telegraphs a crack around its own perimeter within a season or two — and now water is getting in around the edge of the patch instead of through the original hole.

Laying new cloth in and backing it means the panel is carrying load across the repair again. Everything after that is finish work.

Why the finish is the slow part

Making the structure sound takes a day. Making the repair invisible is what takes the calendar time, and the reason is that RV exteriors are not a single flat color.

• The finish has aged. A five-year-old wall in Texas sun is not the color it left the factory. Matching to the code gives you a patch that is right and looks wrong.
• Gelcoat and paint behave differently. Some rigs are gelcoat, some are painted, some are painted over gelcoat, and the repair method follows the substrate.
• It has to be blended, not just matched. A repair sprayed hard to a panel edge shows as a line; blended out into the surrounding area, it does not.
• Everything has to cure between stages, and the weather has an opinion about that.

That is why this job runs across visits rather than being done in an afternoon. Anyone quoting you a same-day turnaround on an impact repair with a finish match is quoting the filler-only version.

This is usually an insurance conversation

Impact damage is the category most likely to be covered and least likely to be claimed, because owners assume the deductible will exceed the repair. On a breached laminated sidewall it very often does not — particularly once the repair has to extend to sound material.

It is worth establishing before you pay out of pocket. We work with insurance claims and with most extended warranty providers, and we would rather have that conversation before the work starts than after.

If yours has been opened up

The thing we would actually ask you to check is not the hole. It is the area around it. Press gently along the panel for two or three feet either side: any softness, any sponginess, or a section that sounds hollow when you tap it compared with its neighbors means water has already tracked along the bond line. That changes the job, and it is better known now.