When does RV roof coating make sense?
A structurally sound roof with an aging membrane, tired sealant everywhere, or minor surface wear is a good candidate. Coating adds one seamless waterproof layer with UV protection, instead of chasing seams every season. Sun-baked EPDM and TPO roofs on seasonal-site trailers are the classic case.
What is the difference between resealing and coating?
Resealing treats the places water gets in: lap sealant at vents, skylights, and the A/C, plus seams, edges, and slide-out transitions. Coating adds a new waterproof layer across the whole membrane. Every roof needs resealing on a schedule. Only a sound roof with a tired surface earns a coating, and it still needs the seams treated first. If a quote calls a whole-roof coating a reseal, or the other way round, ask which job you’re buying.
Why prep decides the outcome
A coating fails when it goes over chalk, dirt, old products that don’t match, or a damp roof. So we strip failed sealant, de-chalk (wash off the white, oxidized layer), prime where needed, and seal seams and penetrations. Then two coats of liquid rubber go on, with full cure time between.
DIY coating kit vs professional application
Store-bought kits use real products. A careful owner with a sound roof and a dry weekend can get a decent result. The gap isn’t the can. It’s everything before it opens.
| Step | DIY kit | Professional application |
|---|---|---|
| Inspection | Owner judgement from the ladder | Full roof and interior check with moisture readings |
| Old sealant | Usually coated over | Removed by hand, the slowest part of the job |
| Product match | One kit for every roof | Cleaner, primer, and coating chosen for EPDM, TPO, fiberglass (fibreglass), or aluminum |
| Conditions | Whatever weekend is free | A dry spell and workable temperatures, so the coating cures |
| Coverage | Often one thin coat | Two coats at the rated thickness, seams and penetrations detailed first |
| Record | None | Dated before-and-after photos |
How long does RV roof coating last?
Longer than the seams around it, and less than the label says. Manufacturer claims vary widely and assume perfect prep in a mild climate. In Ontario, a well-prepped two-coat liquid rubber system on a sound roof gives seasons of protection. We don’t quote a number of years we can’t stand behind. Prep, storage, and a spring and fall check of the sealant decide the lifespan more than the product does.
Coating vs repair vs replacement
Coating can’t fix soft sheathing (the plywood deck under the membrane), soaked insulation, or structural rot. Those get repaired first, and sometimes replacement is the honest call. The inspection tells us which conversation to have.
How much does RV roof coating cost in Ontario?
There’s no flat rate, and a price given before anyone sees the roof is a guess. Final pricing depends on roof size, roof condition, prep requirements, travel, access, visible damage, and hidden damage found during inspection. So we start from photos or an inspection.
| Factor | Why it moves the price |
|---|---|
| Roof size | More surface is more material and more labour |
| Roof condition | Chalking, failed sealant, and prior repairs add prep |
| Prep required | Prep is most of the job; removal and cleaning vary widely |
| Travel and access | Distance, site access, and setup affect the visit |
| Visible damage | Repairs found up front are scoped into the estimate |
| Hidden damage | What the inspection uncovers below the surface |
You see the full estimate before any work begins. Nothing gets done that you haven’t approved, and the number doesn’t change without your say-so.