RV roof care: EPDM, TPO, sealants and coatings
Identify the installed roof and existing products before cleaning, sealing or coating. EPDM, TPO, PVC, fiberglass and metal need their applicable care instructions. A coating decision comes after assessment of leaks, adhesion and the supporting deck; confirm compatibility with the actual roof and existing sealant.
Product compatibility follows the actual roof
Dicor’s 2025 product catalog separates EPDM/PVC coating preparation, TPO primer/coating products, and fiberglass and metal treatments. “RV roof coating” on a container is not evidence that the same preparation works on every roof.
| Material | Check before application |
|---|---|
| EPDM | Membrane maker, compatible cleaner, sealant and coating |
| TPO or PVC | Exact membrane and the required primer/coating arrangement |
| Fiberglass | Surface finish, repair compatibility and care instructions |
| Metal | Seams, fasteners, corrosion and the specified metal treatment |
Confirm material from the actual documentation or manufacturer. Color, chalking or feel alone can misidentify the roof. Existing coatings and sealants also affect adhesion and removal requirements.
Dicor’s two-coat rate changes the quantity
Dicor Acrylic Coating Part 2 for EPDM/PVC specifies its Part 1 cleaner/activator preparation and at least two coats at one gallon per 125 square feet per coat. It directs completing preparation and both coats in one day, with each coat dry to the touch before proceeding.
For an assumed 8-by 30-foot rectangular roof, area is 240 square feet. Two coats require 480 coat-square-feet; dividing by 125 gives 3.84 gallons before actual surface, texture, application and weather effects. Buying only two gallons because one coat fits would miss the two-coat requirement.
The same product warns against freezing conditions below 32°F within 48 hours after application. Check all current preparation, weather and safety instructions before starting. The calculation is product-specific and does not apply to a different coating.
Inspection findings determine repair scope
Inspect seams, penetrations, openings and added equipment under the RV’s schedule and safe-access instructions. Record cracks, lifted material, stains and changes. A stain or soft area needs assessment; its appearance alone does not prove the entry point or hidden damage.
Follow the specified sealant preparation and repair method. Some repairs permit compatible overcoating while others require removal; a universal “always remove everything” rule can damage sound material. Match horizontal or vertical application suitability to the product and joint.
Repair moisture entry and unsound structure before treating a surface as ready for coating. Keep dated findings and receipts, without treating them as a guarantee of warranty coverage. Use the roof-access guide before planning work at height.