Smith’s Poly JF/FC — Semi-Rigid Joint Filler, Fast Cure

Smith’s Poly JF/FC Fast Cure is a heavy-duty, self-leveling, pour-grade, moisture-tolerant 2-component semi-rigid polyurethane joint filler — formulated to fill and protect control and construction joint edges from traffic erosion and spalling under industrial forklift, caster, and vehicular traffic and heavy loads. The “FC” is the fast-cure version: it sets fast enough to shave in 60 minutes, dry-grind in 2.5–3.5 hours, and handle forklift traffic in 14–18 hours — getting your floor back in service quickly. It bonds tenaciously to concrete, epoxy mortars, cementitious urethane mortars, overlays, and industrial coating systems, and can be poured as deep as 5″ and 1.5″ wide in a single lift. This is a drop-ship product, shipped fresh and factory-direct from the manufacturer.

Call for pricing and availability, or request a quote — you’ll talk to a real surface-prep expert, not a call center — fast answers and real recommendations.

Key Highlights

• Heavy-duty — chemical resistant, flexible, tenacious bond
• Fast cure — shave in 60 min, dry-grind in 2.5–3.5 hrs, forklift traffic in 14–18 hrs
• Pourable, self-leveling 2-component filler for interior control or construction joints
• 100% solids, low odor, low VOC
• Protects joint edges from spalling under forklift, caster, and heavy traffic
• Pour as deep as 5″ and 1.5″ wide in a single lift
• Suppresses minor cracks from telegraphing
• Resists aging and elasticity fatigue
• Suitable over in-floor radiant heat systems
• Can be topcoated with thin-film polyaspartics and polyurethanes (under 8 mils) once hard
• Natural beige color; accepts Smith’s ISC Color Packs (excluding white/ivory white)
• Moisture-tolerant; final service temps 40°F–200°F
• FDA/USDA/CFIA-compliant — non-tainting, for regulated facilities
• No red label required for shipping

Why Fast Cure?

When downtime costs money, the Poly JF/FC gets your floor back to work fast:

• Shave in 60 minutes (@ 72°F / 50% humidity)
• Dry-grind in 2.5–3.5 hours
• Forklift traffic in 14–18 hours
• Steam cleaning within 24 hours

Same tough, durable joint protection as the regular-cure Poly JF — but on a schedule that minimizes shutdown time.

Approved Substrates

Concrete and polymer-modified overlays, epoxy/cementitious urethane/polyaspartic/polyurethane coatings, asphalt, tile (ceramic, porcelain, stone, quarry), and properly prepared metal.

Regular Cure or Fast Cure?

Smith’s offers the Poly JF semi-rigid joint filler in two cure speeds:

• Poly JF (Regular Cure) — the standard semi-rigid joint filler for protecting control joints, when fast return-to-service isn’t critical
• Poly JF/FC (Fast Cure) (this product) — the same durable joint protection, but cures fast (shave in 60 min, forklift traffic in 14–18 hrs) — choose it when minimizing floor downtime matters

Not sure which you need? Call us and we’ll help you choose.

Frequently Asked Questions

What’s it for? Filling and protecting concrete control and construction joints from spalling and edge erosion under heavy traffic.

How fast does it cure? Shave in 60 minutes, dry-grind in 2.5–3.5 hours, forklift traffic in 14–18 hours (at 72°F / 50% humidity).

How is it different from the regular Poly JF? Same semi-rigid polyurethane joint filler — the FC version cures much faster for quicker return-to-service.

How deep can I pour it? Up to 5″ deep and 1.5″ wide in a single lift.

What color is it? Natural beige; accepts Smith’s ISC Color Packs (except white/ivory white).

Is it food-safe? Yes — FDA/USDA/CFIA-compliant and non-tainting.

Order Smith’s Poly JF/FC Today

Call (815) 941-4800 x 1 or fill out our contact form. See our concrete repair & patching, Smith Paints, and industrial coatings.

Item #:

• 201612160 – 1.25 Gallon Kit (SCS-POLYJF-FC160kit)