Every installer knows the base coat gets most of the attention – it's the layer that fills profile, builds thickness, and does the structural work. But the topcoat is what the floor actually has to live with day after day: foot traffic, chemical spills, UV exposure, forklifts, cleaning products. If that layer fails, it doesn't matter how good the base coat was underneath it. That's the job SB65 is built for.
What SB65 Actually Is
SB65 is a two-component, high-solids, aliphatic polyester polyurethane topcoat designed to outperform standard sealers and finish coats in moderate to strong chemical environments and heavy-traffic areas. It's UV resistant, mar resistant, and holds its color and gloss over time instead of yellowing or dulling out. A common failure point with lower-grade topcoats.
With a 1:2 mix ratio (A:B) and VOC under 50 g/l, it's compliant for use across all U.S. regions, including SCAQMD.
Built for a Predictable Schedule
For a two-part urethane, SB65 gives you a workable, plannable timeline:
- Pot life: ~60 minutes
- Dry to touch: 6–7 hours
- Recoat window: 7–24 hours (sand and wipe with acetone if you exceed 24 hrs)
- Light foot traffic: after 24 hours
- Walk on: 18 hours
- Drive on / heavy loads: 72 hours
That's enough working time to lay it down right, and a cure schedule you can actually build a job timeline around. No guesswork on when it's safe to open the space back up.
Coverage That Adds Up
As a coating, SB65 covers 300–350 sq ft per gallon. As a sealer, coverage stretches further to 350–400 sq ft per gallon. Either way, it's a topcoat that goes a long way without sacrificing film build or performance.
Why It Holds Up Where Others Don't
SB65 is formulated to take abuse:
- Excellent chemical and abrasion resistance, tested against everything from hydraulic fluid to sulfuric acid
- High gloss or satin finish options, so you can match the look the client wants
- Aliphatic chemistry means it won't amber or yellow under UV like cheaper aromatic urethanes will
- Designed specifically to go over U.S. Resin Supply epoxy systems for a durable, long-term topcoat – apply within 24 hours of the base coat for best adhesion, or sand and prep if more time has passed
Where to Use It
SB65 is a strong fit anywhere a floor needs to survive real-world wear and tear:
- Industrial and commercial floors
- Residential garage floors
- Restaurant and food processing floors
- Automotive service areas
- Concrete masonry sealing
- Faux finish coating systems
- High-traffic industrial spaces
- Any environment with regular chemical exposure
The Bottom Line for Installers
A great base coat with a mediocre topcoat is still a mediocre floor once the client starts using it. SB65 is the layer that protects everything you built underneath it – chemical resistance, abrasion resistance, and color retention that actually lasts, backed by a cure schedule that keeps your job moving.
Working on a job that needs a serious topcoat? Reach out to the team at Big Sky Epoxy Supply – we can help with coverage rates, mix ratios, and pricing for your next project.
U.S. Resin Supply Montana · Missoula, MT · (406) 544-4396 · montana@usresinsupply.com
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