How do I choose the right bond hardness for diamond tooling?

Use soft bonds on hard, dense concrete (high PSI) and hard bonds on soft or porous concrete. For most commercial floors, a medium bond is the safest starting point. Call us at (802) 489-0828 and we'll spec the right bond for your specific floor condition and machine.

Are these diamond tools compatible with my grinder?

US Abrasives stocks tooling compatible with all major grinder brands including Klindex, Lavina, Husqvarna, Superabrasive, STI Prep/Master, HTC, Blastrac, Diamatic, and Onyx. Tell us your machine model and we'll confirm fit before you order.

How fast does my order ship?

In-stock orders placed before 2 PM CST ship same day Monday through Friday via FedEx or UPS Ground. Most U.S. deliveries arrive within 2–5 business days. Expedited shipping is available — call (802) 489-0828 for a quote.

What diamond grit should I start with on a concrete floor?

For most concrete grinding and prep work, start with 16–30 grit metal bond diamonds to open the floor and remove coatings or adhesive. Then progress through 40–60 grit, transition to resin bonds at 100–200 grit for honing, and finish with 400–3000 grit resin pads for polishing. Your starting grit depends on floor hardness and what you're removing.

What tools remove epoxy coatings or glue from concrete?

PCD (polycrystalline diamond) scrapers and hard-bond diamond cup wheels are most effective for removing thick epoxy coatings and adhesive residue from concrete. For thinner coatings, soft-bond metal diamonds work well. We can spec the right tool for your coating type and thickness.

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Polymer Nation

Polymer Nation – F‑81 Flexible Polyurea Joint Filler (2 Gallon Kit)

Q: Do you offer volume or quantity discounts?

Yes. Volume pricing is available on orders of 10 or more pieces of the same item. Call (802) 489-0828 or email info@fast-prep.com to discuss pricing for your crew or job.

$284.17 USD

Sale Sold out

Shipping calculated at checkout.

Product variants

Quantity

✓ Ships M–F via FedEx & UPS · ✓ Same-day shipping on orders before 2 PM · ✓ Expert support: (802) 489-0828

Product Overview

F‑81 is a 2-part, 100% solids, flexible polyurea joint filler designed for heavy-duty interior control joints and saw cuts in concrete floors. With fast gel time and excellent chemical resistance, it helps protect joint edges from spalling in forklift and wheeled traffic environments. F‑81 can also be shaved flush in under 60 minutes.

Typical Uses

Interior control joints and saw cuts in polished or coated concrete
Industrial, warehouse, and retail flooring subjected to hard wheels
Filling joints prior to diamond polishing or coating

Kit Contents (2-gal mix)

Part A – 1 gallon polyurea resin
Part B – 1 gallon catalyst
Total mixed yield: 2 gallons | Approx. 1850 linear feet of ¼″ × ¼″ joint

Key Features

100% solids • VOC-free (0 g/L)
Fast set – shave flush in under 1 hour
Shore A hardness: 85–90
Self-leveling consistency
Excellent chemical, abrasion, and impact resistance

Mixing & Application

Mix Part A and B at a 1:1 ratio by volume. Use dual-cartridge or bulk pump equipment designed for polyurea. Apply directly into clean, dry joints. Material gels in 3–5 minutes at 75°F. Shave flush with a razor scraper or grinder in 30–60 minutes. Best suited for interior use only.

Cure Schedule @ 70 °F (21 °C)

Gel Time	3–5 minutes
Shave Time	30–60 minutes
Light Traffic	1 hour
Full Cure	24 hours

Downloads

F‑81 Technical Data Sheet (PDF)

Always review the full TDS & SDS before use.

Technical Specs

Grinder Compatibility

Shipping & Freight

Standard orders: Most in-stock items ship M–F via FedEx or UPS Ground. Orders placed before 2:00 PM CST typically ship same day.

Freight shipments: Heavy equipment and large orders ship LTL. Our team will contact you to coordinate delivery.

Expedited shipping: Next-day and 2-day air available on request. Call (802) 489-0828 for a quote.

Returns: Unused items may be returned within 30 days in original packaging. Custom or special-order tooling is non-returnable. Contact info@fast-prep.com to initiate.

Frequently Asked Questions

How do I choose the right bond hardness?
Use soft bonds on hard concrete (high PSI/dense) and hard bonds on soft concrete. For most commercial floors, Medium is the safest starting point. Call us at (802) 489-0828 and we'll spec the right bond for your floor condition.

Are your plates compatible with my machine?
We stock tooling for Klindex, Lavina, Husqvarna, Superabrasive, and most other planetary grinders. Tell us your machine model and we'll confirm fit before you order.

Do you offer quantity discounts?
Yes. Volume pricing is available on orders of 10+ pieces of the same item. Call (802) 489-0828 or email info@fast-prep.com to discuss.

How quickly will my order arrive?
In-stock orders placed before 2 PM CST ship same day M–F. Most U.S. deliveries arrive within 2–5 business days via FedEx or UPS Ground.