If you have shopped for a concrete sealer, you have probably seen "water-based" and "solvent-based" on the labels and wondered which one is better. It is one of the most common questions we get about sealing stamped and colored concrete. The answer depends on the look you want, the surface, and what is already on your concrete.
Here is a plain-English comparison of water-based and solvent-based acrylic sealers, and what matters most for decorative concrete in Colorado.
First, a Quick Clarification: Both Can Be Acrylic
People often ask about "water-based versus acrylic" sealers, but acrylic describes the resin, while water-based or solvent-based describes what that resin is carried in. Acrylic sealers come in both versions. Once the water or solvent evaporates, an acrylic sealer leaves a thin protective film on top of the concrete. Concrete Network describes acrylics as ideal "where easy application and economy are important," which is why they are the go-to sealer for most stamped and colored concrete.
So the real comparison is water-based acrylic vs. solvent-based acrylic. Here is how they differ.
Appearance: The Biggest Difference
Solvent-based acrylics darken the concrete and give it a rich, "wet look." They deepen the color of stamped and colored concrete and make the pattern and accent colors stand out. Concrete Network notes that solvent-based acrylics enhance color better than water-based products.
Water-based acrylics protect the surface with little or no color enhancement. Foundation Armor, which makes both types, notes that a water-based sealer can add sheen without changing the color of the concrete. That is a good fit when you want a more natural look, but on stamped concrete most homeowners want the color to pop.
Outdoor Performance
For exterior decorative concrete like patios, driveways and pool decks, solvent-based acrylics are generally the stronger performer. Concrete Network says solvent-based acrylics generally perform better than water-based products for outdoor use. Industry writer Matthew Casto, in Concrete Decor, notes that water-based systems typically offer lower film build and reduced chemical resistance.
That matters in Colorado, where decorative concrete deals with freeze-thaw cycles, intense UV at altitude, and magnesium chloride every winter. Read magnesium chloride and your concrete driveway to see what de-icing salts do to unprotected concrete.
Odor, VOCs and Handling
This is where water-based sealers win. They have little to no odor, lower VOCs (volatile organic compounds), and clean up with soap and water. Casto also notes they are more forgiving to apply and let more moisture vapor pass through.
Solvent-based sealers have a strong odor during application and for a while after, higher VOCs, and they are flammable. They need solvent-resistant rollers and sprayers and should be applied with good ventilation and no open flames nearby. That is one reason many homeowners prefer to have a professional apply them.
Repair and Maintenance
All acrylic sealers wear over time and need to be reapplied. Foundation Armor says acrylic sealers typically need reapplication every 1 to 3 years. On stamped concrete in the Denver area, we generally recommend resealing every 2 to 3 years.
One big advantage of solvent-based acrylic is that it can be "re-dissolved." If it turns white or cloudy, a problem called blushing, Foundation Armor notes it can be repaired with xylene. Xylene softens and reopens the old sealer so it can lay back down clear. That is also why our stamped concrete rejuvenation starts with a xylene treatment to open up the old sealer before we add new accent color and reseal.
When a water-based sealer fails, the fix is usually more involved. Foundation Armor notes that a failing water-based sealer usually needs to be completely removed before recoating.
Can You Switch From One Type to the Other?
Usually not without extra work. The general rule is to recoat with the same type that is already on the concrete: water-based over water-based, solvent-based over solvent-based. Switching types can mean removing the old sealer first, or the new coat may not bond properly and can peel or haze. If you do not know what is on your concrete now, have it checked before you buy a sealer.
Slipperiness
Any glossy acrylic sealer can get slick when wet or icy. On pool decks, steps and sloped driveways, an anti-slip additive mixed into the sealer adds traction. We can add anti-slip to the sealers we apply. See does stamped concrete need to be sealed, and how often for more on reseal options.
Quick Comparison
- Look: Solvent-based gives a darker, richer wet look. Water-based gives little to no color enhancement.
- Outdoor durability: Solvent-based generally performs better outside. Water-based has lower film build.
- Odor and VOCs: Water-based is low odor and low VOC. Solvent-based has strong odor and higher VOCs, and is flammable.
- Application: Water-based is more forgiving and cleans up with water. Solvent-based needs solvent-resistant tools and good ventilation.
- Repair: Solvent-based can be re-dissolved with xylene to fix blushing. Water-based usually has to be stripped when it fails.
- Recoating: Stick with the type that is already on the concrete.
Which One Is Right for Your Concrete?
For exterior stamped and colored concrete where you want rich color, solvent-based acrylic is usually the better choice. That is why we use a solvent-based acrylic sealer on all of our decorative sealing jobs. Water-based acrylic makes sense where odor and VOCs are a concern, such as some indoor areas, or where you want a more natural look. For plain broom-finish driveways, neither is our first choice. We recommend a penetrating salt protector instead, as we explain in should you seal your concrete driveway in Colorado.
Not sure what is on your concrete now or what it needs? We will take a look during a free estimate and recommend the right sealer. Learn more about our concrete sealing services in Denver, or read how to choose your colors for a stamped concrete project.