For roof waterproofing, the best liquid rubber sealant depends on the roof material, project size, and desired finish. Liquid Rubber’s black Roof & Gutter Coating is suited to flat and low-slope surfaces, while MetalSafe is the more targeted option for metal roofs and lightly rusted areas. The white Color Roof Sealant suits buyers who want an elastomeric coating for a clean, dry roof. Compare the five options below by use and container size before choosing.
| Product | Best For | Size |
|---|---|---|
| Roof & Gutter Coating | Flat or low-slope roofs and gutters | 1 quart |
| Roof & Gutter Coating | Larger waterproofing projects | 5 gallons |
| MetalSafe Sealant | Metal roofs and lightly rusted surfaces | 1 gallon |
| MetalSafe Sealant | Larger metal roof projects | 5 gallons |
| Color Roof Sealant | White coating for flat or metal roofs | 1 gallon |
Liquid Rubber Roof & Gutter Coating, 1 Quart
Best for: Small roof, gutter, or maintenance jobs where a quart is a more practical size than a bulk container. This black bitumen formula is listed for flat and metal roofs, low-slope roofs, foundations, gutters, concrete, and planter boxes.
The coating forms a seamless waterproof membrane and is described as having over 950% elongation to accommodate movement and temperature changes. It can be brushed, rolled, or sprayed. For flat or low-slope roofs, the listed application rate is one gallon per 15 square feet, applied in three to four heavy coats for a 60–80 mil membrane.
Limitation: The stated roof coverage and multiple-coat requirement mean a quart is intended for relatively limited areas, not broad roof coverage.
Liquid Rubber Roof & Gutter Coating, 5 Gallons
Best for: Buyers planning a larger roof or gutter coating project who want the same black bitumen formula in a larger container. Its listed surfaces include flat, metal, and low-slope roofs, along with foundations, gutters, concrete, and planter boxes.
The product can be applied by brush, roller, or sprayer. The manufacturer’s stated rate for flat and low-slope roofs is one gallon per 15 square feet, with three to four heavy coats to build a 60–80 mil membrane. The coating is described as flexible, with over 950% elongation, and designed to resist cracking, peeling, and UV damage.
Limitation: Roof coverage is modest per gallon because the specified membrane requires several heavy coats. Estimate the area and application depth before selecting a container size.
Liquid Rubber MetalSafe Sealant, 1 Gallon
Best for: Metal roof owners who want a coating specifically presented for metal leak repair and corrosion protection. The listed uses also include sheds and gutters. The sealant can be applied directly over lightly rusted surfaces.
MetalSafe is described as fast drying and as forming a durable waterproof surface with UV stability. It can be applied with a conventional brush or roller, or with a heavy-duty airless paint sprayer appropriate for the material. Choose this over the general Roof & Gutter Coating when metal roof use and corrosion protection are the primary selection criteria.
Limitation: The supplied product details do not give a coverage rate. Follow the product’s coverage instructions and apply generous coats until the stated final coverage rate is reached.
Liquid Rubber MetalSafe Sealant, 5 Gallons
Best for: Larger metal roof, shed, or gutter projects where a five-gallon container better matches the planned amount of work. Like the one-gallon option, it is designed for metal surfaces, offers corrosion protection, and can go over lightly rusted areas.
Application options include a conventional brush, roller, or suitable heavy-duty airless sprayer. The sealant is described as fast drying and UV stable. Compared with the smaller MetalSafe container, this size is the more relevant choice for a broader project, but the supplied product information does not state its coverage.
Limitation: Do not assume a coverage figure based on container size alone. Check the product’s application directions to determine how much is needed and how many coats to apply.
Liquid Rubber White Color Roof Sealant, 1 Gallon
Best for: Buyers seeking a white elastomeric coating for flat, low-slope, or metal roofs. It forms a seamless flexible membrane and is described as having up to 900% elongation, allowing it to flex with roof movement.
This product applies by brush, roller, or airless sprayer and builds a membrane through multiple heavy coats. The directions specify applying it to clean, dry roof surfaces. Full cure typically occurs within 24–48 hours, according to the product details. Choose it when a white finish is preferred over the black options in this comparison.
Limitation: The roof must be clean and dry, and multiple heavy coats are required. Plan for the stated curing time before assuming the coating is fully cured.
Buying Guide: How To Choose A Liquid Roof Sealant
Which sealant suits your roof material?
For metal roofing, MetalSafe is the more specialized choice and is listed for lightly rusted surfaces. The black Roof & Gutter Coating also lists metal roofs among its uses, alongside flat and low-slope roofs. Color Roof Sealant is another option for metal roofs when a white coating is desired. Check the product directions and confirm that the roof surface matches the intended application.
How much product should you buy?
Use the stated coverage rate when it is available. For the black Roof & Gutter Coating, the listed flat-roof rate is one gallon per 15 square feet for three to four heavy coats. That specification makes a quart a better fit for limited work than broad coverage. MetalSafe’s provided details do not state coverage, so consult its directions rather than estimating from the container size alone.
What application and preparation matter?
Check whether the product supports your preferred tool. The products described here can be brushed or rolled; some can also be sprayed with suitable equipment. Color Roof Sealant specifically calls for a clean, dry roof. Follow each product’s instructions for coat thickness, final coverage, and curing before exposing the surface to expected conditions.
Frequently Asked Questions
Can liquid rubber sealant be used on a flat roof?
Yes. The black Roof & Gutter Coating and white Color Roof Sealant are both listed for flat or low-slope roofs. Follow their application and coverage directions.
Which option is intended for lightly rusted metal?
MetalSafe Sealant is specifically described as suitable for application over lightly rusted surfaces.
How many coats does roof sealant need?
The black Roof & Gutter Coating specifies three to four heavy coats for a 60–80 mil membrane on flat or low-slope roofs. Color Roof Sealant also requires multiple heavy coats.
How long does Color Roof Sealant take to cure?
The product details state that full cure typically occurs within 24–48 hours. Apply it to a clean, dry roof and follow the product directions.
Can these coatings be sprayed?
The Roof & Gutter Coating can be brushed, rolled, or sprayed. MetalSafe can also be sprayed using an appropriate heavy-duty airless paint sprayer. Check the directions for equipment requirements.