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CONCRETE BASECOAT SELECTION MATRIX
Polybase 98
The professional high-solids polyurea engineered for extreme speed.
Epoxy Flow 100
The high-build cyclic amine formula designed for ultimate flow and leveling.
Polyaspartics (85/90)
The ultimate Aliphatic formula. Highly forgiving working times & direct-to-substrate strength.
What is the Best Basecoat for a Flake Floor Coating?
The Quick Answer
The "best" basecoat depends entirely on your installation speed, experience level, and specific project requirements:
- For Professionals & Speed (The One-Day Floor): Use Polybase 98 Polyurea. It dries in just 2 - 4 hours, allowing a full scrape and topcoat in a single day.
- For DIYers & Beginners (Stress-Free Pace): Use Poly 85 Slow Polyaspartic. It gives you a massive 45-minute working time, will never yellow, and allows you to buy and use the exact same product for both your basecoat and topcoat.
Choosing the correct basecoat is the single most important step in achieving a professional, long-lasting concrete floor. The basecoat is responsible for penetrating the prepared concrete, creating a tenacious mechanical bond, and providing the foundation for subsequent decorative media (like flakes or metallics) and topcoats.
This guide outlines our three high-performance basecoat options from ConcreteFloorSupply.com: Polybase 98, Epoxy Flow 100, and the Polyaspartic family (Poly 90 & Poly 85 Slow).
1. Quick Comparison Matrix
| Feature | Polybase 98 (Polyurea) | Epoxy Flow 100 (Epoxy) | Poly 90 / 85 Slow (Polyaspartic) |
|---|---|---|---|
| Solids Content | 98% ± 1% | 100% | 90% (90) / 85% (85 Slow) |
| Coverage | 250 - 350 sq.ft/gal | 100 - 150 sq.ft/gal | 200 - 300 sq.ft/gal |
| Pot Life | 5 - 15 mins | 20 - 45 mins | 25 mins (90) / 45 mins (85 Slow) |
| Dry Time | 2 - 4 hours | 6 - 8 hours | 3 - 8 hours |
| UV Stability | Poor (Will amber) | Moderate | Excellent (100% Stable) |
2. Deep Dive: Product Breakdown
Option A: Polybase 98 (The Flake Specialist)
Polybase 98 is a low-odor, 98% solids, two-component polyurea. It is engineered specifically as a fast-curing basecoat/primer for full-broadcast flake or quartz systems.
- Why It's Chosen: It offers an incredibly fast cure rate (dry to touch in 2 - 4 hours), making a "One-Day Floor" install highly achievable.
- The UV Stability Catch: Polybase 98 is not UV stable when left exposed. It is designed strictly for full-broadcast flake or solid-color systems where it will be 100% covered.
- Crucial Rule: Must be topcoated/re-coated within 12 hours. If you miss this window, you must mechanically sand the floor.
Option B: Epoxy Flow 100 (The Thick Builder & Metallic King)
Epoxy Flow 100 is our highly versatile, 100% solids clear epoxy formulated with premium cycloaliphatic amine curing agents. It creates a thick, self-leveling wear layer.
- Why It's Chosen: It has unmatched flow characteristics, curing into a glassy, high-build finish (~16 mils). Because of its thick build and slow, organic flow, it is the only choice for metallic epoxy floors.
- Adhesion & Build: Exceptional. Zero shrinkage as it cures.
- UV Stability: While highly resistant to early yellowing compared to standard hardware-store epoxies, it is still an epoxy and will eventually amber under direct UV/sunlight.
Option C: Poly 90 & Poly 85 Slow (The UV-Stable Choice)
Our Polyaspartic line represents the peak of modern resin technology. These are incredibly tough, flexible, and chemical-resistant aliphatic coatings.
- Why It's Chosen: They are 100% UV stable. They will never yellow, fade, or amber, regardless of direct sunlight exposure.
- Best For: "Grind and Seals", Inexperienced/Beginner Installers, and Simplified Purchasing.
- The Poly 85 Slow Advantage: If you are a beginner, choosing Poly 85 Slow gives you a massive 45-minute bucket life. This eliminates the panic of the product hardening too quickly. Furthermore, you can use the exact same product for both your basecoat and your topcoat, meaning less waste and zero confusion.
3. Quick Decision Finder
Polybase 98 will dry in 2 - 4 hours, allowing you to scrape your flakes and topcoat the very same day.
High-build epoxy is the only chemistry that allows metallic powders to suspend, flow, and create depth without setting up too fast.
You get the absolute highest-grade industrial coating with the peace of mind of a 45-minute pot life. Plus, buying just one product for the entire system cuts down on waste.
4. Crucial Guidelines for All Systems
- Mechanical Prep is Mandatory: You must grind your concrete using a diamond grinder to achieve a concrete surface profile of CSP 2 or CSP 3. Acid etching is not recommended.
- No Water/Moisture: Do not wash your floor with water before coating. Ensure the concrete slab is 100% dry.
- Respect the Recoat Windows: If you exceed the maximum recoat window for your chosen product, you must lightly scuff/sand the surface before applying the next layer.
