Liquid rubber waterproof sealant coating can form a flexible barrier against water on roofs, gutters, foundations, and other listed surfaces. The Liquid Rubber Store roof and gutter coating is best for larger roof projects, with one-gallon and five-gallon sizes for different job scales. Its quart size suits smaller repairs. Flex Seal Liquid is better for compact applications where black or clear coating is preferred. Compare the intended surface, package size, stated coverage, and finish before choosing.
| Product | Best for | Key distinction |
|---|---|---|
| Liquid Rubber Roof & Gutter, 1 Gallon | Small roof or gutter projects | Coverage guidance for roof and vertical surfaces |
| Liquid Rubber Roof & Gutter, 5 Gallon | Larger coating jobs | Bulk package of the same listed coating |
| Liquid Rubber Roof & Gutter, 1 Quart | Small-area maintenance | Smaller package for limited projects |
| Flex Seal Liquid, Black, 16 oz | Small repairs needing a black finish | Can be brushed, rolled, dipped, or poured |
| Flex Seal Liquid, Clear, 16 oz | Small repairs needing a clear finish | Clear liquid rubber coating |
Liquid Rubber Roof & Gutter Coating, 1 Gallon
This black bitumen-based coating is best for homeowners handling a modest roof, gutter, or foundation project who need more product than a small repair can but do not need the listed five-gallon container. The manufacturer describes it as a flexible, seamless waterproof membrane for flat and low-slope roofs, metal roofs, foundations, gutters, concrete, plywood, and planter boxes.
The product can be applied by brush, roller, or sprayer. Its listed elongation is over 950%, and the coating is designed to resist cracking, peeling, and UV damage. The stated application guidance is important: for flat or low-slope roofs and standing-water surfaces, one gallon covers 15 square feet with three to four heavy coats. For vertical surfaces, one gallon covers 30 square feet with two to three heavy coats.
- Best for: A repair or maintenance area that fits the stated coverage.
- Why it was selected: The listing gives surface-specific coverage and coat guidance, making it easier to estimate material needs.
- Consider: The black finish and heavy-coat requirements may not suit every appearance or project size.
Liquid Rubber Roof & Gutter Coating, 5 Gallon
This five-gallon version is best for larger projects or preventative maintenance that require more coating than a quart or one-gallon package. It has the same listed bitumen formula and uses as the smaller Liquid Rubber sizes: flat and low-slope roofs, metal roofs, gutters, foundations, concrete, plywood, and planter boxes.
The coating is described as a flexible rubberized membrane with over 950% elongation. It can be brushed, rolled, or sprayed. The manufacturer’s guidance calls for 60–80 mils on flat or low-slope roof and standing-water surfaces, using three to four heavy coats. For vertical surfaces such as foundations, the guidance is 30 mils with two to three heavy coats. Coverage is listed as 15 square feet per gallon for roof surfaces and 30 square feet per gallon for vertical surfaces.
- Best for: Broad coating jobs where the stated coverage suggests multiple gallons may be needed.
- Why it was selected: Its larger package matches the product’s listed use for roof repair and preventative maintenance.
- Consider: The product is black, and the listed application requires multiple heavy coats rather than a single pass.
Liquid Rubber Roof & Gutter Coating, 1 Quart
The quart package is best for limited repairs or maintenance areas where buying a gallon may be more material than needed. It shares the listed black bitumen formula and surface applications of the one- and five-gallon versions. The product is intended for roofs, gutters, foundations, concrete, plywood, and other listed surfaces.
As with the larger sizes, it can be applied by brush, roller, or sprayer. The manufacturer specifies coverage of 15 square feet per gallon for flat and low-slope roofs or standing-water surfaces, and 30 square feet per gallon for vertical surfaces. Those figures are per gallon, so a quart covers only a fraction of those stated areas. The listing recommends multiple heavy coats to achieve the specified membrane thickness.
- Best for: A small project where the quart quantity is appropriate.
- Why it was selected: It offers the same listed coating features in the smallest Liquid Rubber package provided.
- Consider: The smaller quantity may not be enough for larger areas, especially when several coats are required.
Flex Seal Liquid Rubber Coating, Black
Flex Seal Liquid in black is best for small repairs where a black finish is suitable and the user wants several application options. The listing says the liquid rubber can be brushed, rolled, dipped, or poured. It is described as a flexible, watertight coating that seals out water, air, and moisture, and as suitable for uses such as roofs, basements, RVs, gutters, and masonry.
This 16-ounce container is a compact alternative to the larger Liquid Rubber roof-coating packages. It is a better fit when the project calls for a small amount and the flexible application methods are useful. The listing also describes the coating as UV resistant and as helping prevent rust and corrosion.
- Best for: Small, varied applications that can use a black coating.
- Why it was selected: The listing identifies multiple ways to apply it and names several repair settings.
- Consider: The supplied product details do not state coverage per container, so estimate material needs cautiously.
Flex Seal Liquid Rubber Coating, Clear
The clear Flex Seal Liquid coating is best for small projects where a black coating would be undesirable. Its listed application methods are brushing, rolling, dipping, or pouring. The product is described as a smooth-application liquid rubber that creates a flexible, watertight coating to seal out water, air, and moisture.
The listing names roofs, basements, RVs, gutters, and masonry among possible uses, and describes the coating as UV resistant and as helping prevent rust and corrosion. The clear finish is the key reason to choose this version over the black option, though the supplied information does not specify how transparent the finished coating appears on every surface.
- Best for: Small applications where clear coating is preferred to black.
- Why it was selected: It offers the listed liquid-rubber application options in a clear version.
- Consider: No coverage rate is included in the supplied details, so this package is harder to compare for area-based projects.
Buying Guide: How to Choose Liquid Rubber Waterproof Sealant
Which surfaces and project areas need coating?
Start by checking that the product listing names the surface you plan to coat. The Liquid Rubber roof and gutter coating lists flat and low-slope roofs, metal roofs, gutters, foundations, concrete, plywood, and planter boxes. Flex Seal Liquid lists roofs, basements, RVs, gutters, and masonry. A product’s general waterproofing description does not replace checking the listed intended uses for your specific job.
Measure the repair area before choosing a package. A small patch may suit a quart or 16-ounce container, while a larger roof area may call for the five-gallon size. Do not base the quantity on container size alone: the Liquid Rubber listing specifies multiple coats, so the project’s final coverage depends on the surface and the application thickness.
How much coating should you plan for?
For the Liquid Rubber roof and gutter coating, the stated coverage is 15 square feet per gallon on flat or low-slope roofs and standing-water surfaces, using three to four heavy coats for a 60–80 mil membrane. On vertical surfaces, the listing gives 30 square feet per gallon with two to three heavy coats for a 30 mil membrane. Use the matching surface figure when estimating; the vertical-surface rate should not be applied to a roof estimate.
The Flex Seal Liquid details provided do not include coverage per container. If you need to coat a measured area, consult the product packaging or its current listing for coverage and application directions before deciding how many containers to buy.
Does the finish matter?
Finish can influence which coating is appropriate for a visible repair. The Liquid Rubber roof and gutter coating is black. Flex Seal Liquid is offered here in black and clear. Choose a finish that suits the surface and the appearance you want; do not assume a clear coating will be invisible or that a black coating will blend with a particular roof or gutter.
Which application method fits the job?
The Liquid Rubber listing says the coating can be brushed, rolled, or sprayed. Flex Seal Liquid can be brushed, rolled, dipped, or poured. Consider the shape and size of the work area when comparing methods. The product details provided do not specify the tools required for every surface, so follow the directions on the container for preparation and application.
When is a larger container the better choice?
Choose a larger package when the measured project area and listed coat requirements call for more material. The five-gallon Liquid Rubber container is better suited to larger roof or maintenance jobs than the quart size. For a limited repair, a smaller package may reduce excess material. Estimate using the product’s stated coverage, then check the label before purchase for any surface-specific directions.
Frequently Asked Questions
What is liquid rubber waterproof sealant coating?
It is a liquid-applied coating that forms a rubberized waterproof barrier after application. The products here are described as flexible coatings for sealing water, with listed uses that vary by product.
Which listed product gives roof coverage information?
The Liquid Rubber roof and gutter coating provides coverage guidance: 15 square feet per gallon for flat or low-slope roofs and standing-water surfaces, and 30 square feet per gallon for vertical surfaces. The listing also specifies multiple heavy coats.
Which option is best for a small repair?
The one-quart Liquid Rubber coating or a 16-ounce Flex Seal Liquid container may suit a limited repair. Choose based on the listed surface, preferred finish, application method, and the amount of coverage the job requires.
Is there a clear liquid rubber option in this selection?
Yes. Flex Seal Liquid is listed in a clear 16-ounce version. The supplied product information does not specify its coverage rate or how transparent the finished coating appears on different surfaces.
Can liquid rubber coating be used on a vertical surface?
The Liquid Rubber roof and gutter coating lists foundations as a vertical-surface use and gives a coverage rate of 30 square feet per gallon with two to three heavy coats. Check the product directions for the surface you plan to coat.
How many coats does the Liquid Rubber roof coating require?
The listing recommends three to four heavy coats for flat or low-slope roofs and standing-water surfaces, and two to three heavy coats for vertical surfaces. It ties those coat counts to specified membrane thicknesses.
