10 Best Waterproof Paint in 2026

A single gallon blocks up to 12 PSI of water pressure, which means this paint can stop serious seepage through concrete, brick, and cinder block walls without needing a separate primer or sealant. The nanotechnology creates a dense barrier that holds back moisture from both interior basements and exterior retaining walls, making it a one-coat solution for high-humidity spaces. Low odor and a fast recoat time of 4 hours keep the project moving, so you can finish a wall in a day rather than waiting overnight between coats.

Engineered with advanced nanotechnology, this paint creates a powerful water barrier that blocks up to 12 PSI of water pressure, helping stop infiltration on concrete and masonry surfaces. It works for both interior and exterior applications, making it suitable for basement walls, stucco, brick, concrete blocks, and retaining walls. For below-grade use, fill all holes and cracks with hydraulic cement before painting. The finish resists alkali buildup and stands up to high-moisture areas, so it holds up in tough basement and outdoor conditions. Backed by over 50 years of KILZ expertise, it delivers long-lasting results.

With a guarantee to stop water seepage under up to 20 pounds of pressure, this paint is built for basements and masonry walls where moisture is a persistent problem. The smooth, bright white finish goes on without grit, so it looks clean and uniform even on rough concrete or cinder block. Ultra low odor makes it far more comfortable to apply in enclosed spaces than solvent-based alternatives, and cleanup with soap and water keeps the process simple. For anyone battling mold and mildew on interior masonry, this is the most focused solution in the guide.

The Zinsser WaterTite Mold & Mildew White Waterproofing Paint resists up to 20 lbs. of water pressure, so it can stop water seepage through basement walls even under significant hydrostatic force. It’s a latex-base paint with a very smooth, bright white, non-gritty finish that applies easily to dry walls with a brush or roller. The ultra-low odor and easy soap-and-water cleanup make it convenient for indoor use, and it’s backed by a 15-year waterproof guarantee and a 10-year mold and mildew-proof paint film guarantee.

With 12 psi of hydrostatic pressure resistance, this paint can handle damp basements and retaining walls where water pushes hard against the surface. The high alkali resistance, up to pH-13, means it won’t break down on fresh concrete or cinder block, which often stay alkaline for months. That combination makes it a natural fit for vertical masonry walls that need real waterproofing, not just a cosmetic coat.

The trade-off is that this is strictly for vertical surfaces; you cannot use it on a basement floor or patio. If your wall is a straightforward vertical foundation or retaining wall, the INSL-X gives you the extra margin against water pressure.

A two-part epoxy acrylic that must cure for three full days before seeing water might sound demanding, but that wait is exactly what gives this kit its edge on bathroom surfaces. The durable coating bonds to ceramic, porcelain, fiberglass, cast iron, and steel, creating a washable, waterproof finish that looks like fresh porcelain. For anyone with a worn tub or sink who wants to skip the cost of replacement, this is the focused solution.

This Rust-Oleum kit is a refinishing tool, not a general waterproof paint, so it fits best when you are willing to plan around the cure time for a long-lasting, glossy bathroom refresh. The trade-off is patience: you cannot use the shower or bath for three days after the final coat. That is a real inconvenience.

A water-based enamel that resists alkali, water, and blistering makes this a strong option for horizontal surfaces that see heavy foot traffic. The fade-resistant formula helps colors stay bright on patios, pool decks, and basement floors. It suits anyone looking for a durable finish on concrete or wood floors that face sun, moisture, and regular use.

For a porch or pool deck that needs a tough, attractive coating that stands up to weather and traffic, this enamel delivers where it counts. The catch is that it is designed for floors and patios, not for vertical masonry walls where waterproofing against seepage matters more.

Covering 250 to 400 square feet per gallon, this KILZ formula is built for textured surfaces like stucco and brick where ordinary paints struggle to grip. Its self-priming design means you skip the separate primer step, cutting prep time while still getting strong adhesion and water repellency on rough masonry. The acrylic latex base handles both indoor and outdoor jobs, and it resists alkali up to pH 12.0, so fresh concrete or mortar won’t eat through the finish. It works as a straightforward paint for uneven or porous masonry walls.

The flat finish hides surface imperfections well but can be harder to clean than a satin or semi-gloss. Coverage depends heavily on how rough your surface is, so a heavily textured stucco wall might need the lower end of that range. This paint is alkali-resistant up to pH 12.0, which means it can handle the alkaline conditions common on fresh masonry and stucco without peeling. If your goal is a self-primed coat on brick or stucco, this formula is an option.

Compared to the Zinsser WaterTite Mold & Mildew paint, which is meant for basement masonry and stopping water seepage, Perma-White targets interior bathroom surfaces rather than blocking bulk water pressure. The WaterTite line handles active leaks or damp basement walls, while Perma-White is for dry bathroom walls where you want a mildew-resistant topcoat.

The paint film is labeled mold- and mildew-proof, which means it resists growth in damp conditions. The water-base formula has low odor during application, and the self-priming design sticks to metal and wood without sanding. For anyone painting surfaces where moisture is a concern, this enamel delivers a washable, scrubbable finish.

This enamel tints only to off-white, pastel, and medium shades, so deep or vivid hues are off the table. The eggshell sheen also offers less abrasion resistance than a gloss finish, meaning it may show scuffs sooner on frequently touched surfaces. For moisture-prone wood and metal indoors, this Rust-Oleum enamel is a self-priming, water-base option that sticks without sanding. If you need a waterproof coating for interior masonry surfaces that resists mold and mildew, the Zinsser WaterTite is designed for that job.

A 35-ounce container covers up to 86 square feet, which means you can coat a medium-sized gate or a set of railings without needing a second can. This formula is made for metal surfaces that face the elements, rain, salt spray, and even high heat won’t break its seal. It also converts existing rust into a stable protective layer, so you don’t have to sand or grind before applying. That makes it a time-saver for anyone restoring outdoor furniture, car frames, or farm equipment. The matte black finish gives a clean, uniform look, and the included brushes and gloves mean you can start right out of the box.

You’ll need at least two thin coats to get the full durability, so plan for a bit more time on the job. That extra step buys you multi-year outdoor protection on metal surfaces like iron gates, steel structures, fences, railings, car frames, trailers, farm equipment, auto chassis, marine boats, and outdoor metal furniture. You won’t need to sand or grind to prep. If your project involves porous masonry, you’ll want a dedicated waterproofing paint for those surfaces instead.

A 15 PSI hydrostatic pressure rating means this sealer is built for demanding below-grade conditions, where groundwater pushes directly against basement and foundation walls. The water-based polyurethane formula bonds to slightly damp concrete too, which is a real help when you’re working in a basement that never fully dries out.

Coverage is the main trade-off: at 100 square feet per gallon, you’ll need to plan your material purchase accordingly. Surface prep is also non-negotiable: you have to repair cracks and leaks before applying, or the pressure will find its way through. Still, for anyone whose main worry is hydrostatic pressure pushing moisture through masonry, this sealer’s raw resistance is what matters most.