Cool roof coatings can help reflect sunlight, protect a suitable roof surface, and reduce heat absorption. The right choice depends on your roof material, the area you need to cover, and the weather conditions during application. If you’re specifically looking for a coating for polyurethane foam, one pick below lists that surface as compatible; none of these products is spray foam insulation or a replacement for it.
Table of Contents
Quick Comparison
| Product | Best for | Key details |
|---|---|---|
| Gardner-Gibson Sta-Kool 15-Year Turbo-Dri | Fast-drying acrylic roof coating | Rain safe in 30 minutes; recoating in three hours |
| Jetcoat Cool King Premium White | Multiple roof materials, including polyurethane foam | Two coats recommended; listed coverage is about 50–70 square feet per gallon per coat |
| Liquid Rubber RV Roof Sealant | RV and camper roofs | For EPDM, TPO, fiberglass, and aluminum; primer may be needed |
Our Picks: Best Cool Roof Foam And Coatings reviews
Gardner-Gibson Sta-Kool Turbo-Dri: Best for a Faster Coating Schedule
Sta-Kool is a white acrylic elastomeric roof coating designed to reflect heat and protect a roof from UV exposure. Its Cool-Core technology uses specialized pigments intended to reduce heat gain. The flexible coating comes in a five-gallon container and is applied with a roller.
Its main advantage is the quick application schedule. The coating is described as rain safe in 30 minutes and ready for another coat in three hours. That can be useful when you need to complete a project efficiently or want less exposure to a sudden rain shower. Still, check the product label and forecast before starting, and make sure your roof surface is suitable—the supplied product information does not list specific compatible roof materials.
Compared with Jetcoat, Sta-Kool emphasizes faster recoating rather than providing a coverage estimate or a list of roof types. Compared with Liquid Rubber, it is positioned for roof coating broadly rather than specifically for RV roof systems. The 15-year wording appears in the product name, but check the label for the exact terms and conditions behind any protection claim.
Pros:
- Rain-safe claim of 30 minutes
- Recoating in three hours
- White, flexible acrylic coating with heat-reflective pigments
- Roller application and five-gallon packaging
Cons:
- Supplied product details do not specify compatible roof materials or coverage
- Requires checking the label to confirm surface preparation and application conditions
Verdict: Choose Sta-Kool if quick recoating and a short stated rain-safe window matter most, but verify that your roof material is approved before buying.
Jetcoat Cool King: Best for Listed Compatibility with Polyurethane Foam
Jetcoat Cool King is a white, fortified acrylic elastomeric coating intended to reflect sunlight. Its listed compatible surfaces include polyurethane foam, EPDM rubber, modified bitumen, asphalt, mobile homes and RVs, concrete, and wood. It is not listed for gravel, dead-level flat roofs, or shingled roofs, so check those exclusions carefully before you plan a project.
The product information gives a coverage range of about 50–70 square feet per gallon per coat and recommends two coats for best coverage. That makes estimating material easier than with the other picks, though your actual needs depend on the surface and application. It also has specific weather requirements: apply when the temperature is at least 60°F and rising, and do not apply if temperatures may fall below 60°F within 24 hours. The first coat takes about two to three hours to dry to the touch; wait six to eight hours before applying the second.
Compared with Sta-Kool, Jetcoat takes longer between coats but provides more detail about compatible materials and coverage. It is the clearest match here for someone coating polyurethane foam, provided the roof is not one of the excluded surfaces and the foam system’s own requirements allow the coating.
Pros:
- Polyurethane foam is among the listed compatible surfaces
- Coverage estimate helps with project planning
- Also lists several other roof materials, including EPDM and modified bitumen
- White reflective coating with a stated 10-year protection period
Cons:
- Not for gravel, dead-level flat, or shingled roofs
- Temperature limits and the wait between coats can make scheduling important
Verdict: Jetcoat is the most straightforward pick for a compatible polyurethane foam roof, as long as your roof type and application conditions meet its stated requirements.
Liquid Rubber RV Roof Sealant: Best for Camper and Trailer Roofs
Liquid Rubber RV Roof Sealant is a white, water-based elastomeric coating made for RV, camper, and trailer roof projects. Its listed surfaces include EPDM, TPO, fiberglass, and aluminum. The product is designed to form a flexible waterproof membrane, with reflective properties intended to reduce heat absorption.
The application instructions allow a brush, roller, or sprayer, with a recommended temperature range of 50°F to 90°F. The stated coverage is one gallon per 50 square feet to reach the recommended final thickness. For EPDM and TPO, the product information recommends using its EPDM and TPO primer to improve adhesion. It also describes a system that includes a cleaner and calls for lap sealant or seam tape at joints and transitions where movement may occur.
This is a more specialized choice than Jetcoat, which lists a broader range of roof materials, or Sta-Kool, which focuses on a fast coating schedule. The added prep and seam products can mean more steps, but they matter when you are sealing an RV roof with vents, skylights, or joints. The supplied information does not list polyurethane foam as a compatible surface, so do not assume it is suitable for that use.
Pros:
- Lists EPDM, TPO, fiberglass, and aluminum RV roofs as compatible
- Can be applied with a brush, roller, or sprayer
- Water-based formula is described as zero VOC
- Coverage guidance is provided for the recommended final thickness
Cons:
- Primer is recommended for EPDM and TPO surfaces
- Seams and transitions may require separate tape or lap sealant
Verdict: Choose Liquid Rubber for an RV or camper roof when its listed materials match your roof and you are prepared to follow the full surface-prep and seam-sealing process.
How to Choose a Cool Roof Coating
Match the Coating to Your Roof Material
Start by identifying what your roof is made of. A coating that works on one surface may not bond properly to another. Jetcoat lists polyurethane foam and several other materials, while Liquid Rubber lists specific RV roof materials. Sta-Kool’s supplied details do not name compatible surfaces, so check its label or manufacturer guidance before applying it. Do not treat a coating as a universal solution for every roof.
Understand What “Cool Roof” Means for Your Project
These products are coatings designed to reflect heat or reduce heat absorption; they are not foam insulation. If your goal is to add insulation, a roof coating alone does not do that job. If you have a foam roof, choose a coating only when the product and the foam system both allow it. Jetcoat specifically lists polyurethane foam, but you should still confirm the requirements for your roof assembly.
Estimate Coverage and Number of Coats
Measure the area you plan to coat and use the product’s stated coverage to estimate how much material you need. Jetcoat lists about 50–70 square feet per gallon per coat and recommends two coats. Liquid Rubber calls for one gallon per 50 square feet to reach its recommended final thickness. The supplied Sta-Kool details do not include a coverage figure, so consult the container instructions rather than estimating from the other products.
Plan Around Temperature, Drying, and Rain
Application conditions can affect whether you can finish the job as planned. Jetcoat specifies a minimum temperature of 60°F and rising, with no expected drop below 60°F within 24 hours. Liquid Rubber lists an application range of 50°F to 90°F. Sta-Kool is described as rain safe in 30 minutes, while its recoat time is three hours. Treat these as product-specific directions, not interchangeable rules, and follow the label for your chosen coating.
Check Prep, Primers, and Roof Details
Good planning includes more than coating the main roof surface. For EPDM and TPO, Liquid Rubber recommends its primer, and its product information calls for seam tape or lap sealant at certain joints and transitions. For any coating, check the label for surface cleaning, repair, and application instructions. Make sure the surface is sound and that roof details such as vents and skylights are addressed with compatible materials.
Consider Exclusions and Project Size
Review product limitations before buying. Jetcoat is not listed for gravel, dead-level flat roofs, or shingles. Liquid Rubber is packaged as a one-gallon container in the product listing, while Sta-Kool and Jetcoat are five-gallon products. Consider your roof size, the number of coats, and any required primer or seam products when deciding which package makes sense.
Frequently Asked Questions
Can I use a roof coating instead of foam insulation?
No. These products are roof coatings, not foam insulation. A reflective coating may help reduce heat absorption, but it does not replace insulation. Use products designed for your roof system and intended purpose.
Which product specifically lists polyurethane foam as a compatible surface?
Jetcoat Cool King lists polyurethane foam among its compatible surfaces. It also excludes gravel, dead-level flat, and shingled roofs. Confirm your roof’s exact construction and follow the product label before applying it.
Which coating is made for RV roofs?
Liquid Rubber RV Roof Sealant is specifically presented for RV, camper, and trailer roofs. Its listed roof materials include EPDM, TPO, fiberglass, and aluminum. It recommends primer for EPDM and TPO surfaces.
How many coats should I apply?
Jetcoat recommends two coats. Liquid Rubber states that one gallon covers 50 square feet at the recommended final thickness. For Sta-Kool, use the label to confirm the required amount and coating schedule, since the supplied product details do not state coverage or coat count.
Can I apply these coatings if rain is expected?
Sta-Kool is described as rain safe in 30 minutes, but that does not remove the need to follow its label and check the weather. For Jetcoat and Liquid Rubber, follow their product instructions and allow the specified drying and application conditions before exposure to rain.
Do I need a primer?
Liquid Rubber recommends its EPDM and TPO primer for those surfaces. The supplied details do not specify primer requirements for Sta-Kool or Jetcoat, so check each product’s label and the roof manufacturer’s instructions.
Final Recommendation
For a compatible polyurethane foam roof, Jetcoat Cool King is the clearest fit because its product information specifically lists that surface and provides coverage and temperature guidance. For a faster coating schedule, consider Sta-Kool, after confirming compatibility with your roof. For an RV or camper, Liquid Rubber is the specialized option, especially if you are ready to follow its primer and seam-preparation guidance. In every case, verify the roof material and follow the product label before starting.
