Flake broadcast installation

Flake broadcast installation is a five-stage sequence: grind the slab, apply a pigmented epoxy base, throw vinyl flake into the wet film until it refuses more, scrape the excess after cure, and seal the texture with a clear topcoat. The step that decides the look is the broadcast: flake must land while the epoxy is still tacky, or it will sit on a cured skin and scrape away in sheets.

What the system is made of

A flake broadcast floor is a decorative epoxy system in which vinyl chips are embedded in a pigmented base coat and locked under a clear wear layer. The flakes provide color and hide dust and tire marks; the topcoat provides the actual resistance to abrasion, chemicals, and hot tires.

The base is a 100 percent solids or high-solids epoxy applied at 8 to 12 mils. The flake is a vinyl chip in a graded blend, usually 1/4 inch or 1/8 inch. The topcoat is an aliphatic polyurethane or polyaspartic at 3 to 6 mils. Each layer has a job and a recoat window.

Tools and materials that matter

A shop vacuum with a HEPA filter is not optional. Grinding dust that is not removed becomes a bond breaker under the base coat.

The installation sequence

1. Test the slab for moisture and note cracks, spalls, and any previous coating.
2. Grind the entire surface with a diamond tool, then edge with a hand grinder and vacuum clean.
3. Repair cracks and spalls with an epoxy patch and allow a full cure.
4. Roll the pigmented epoxy base at the stated coverage, working in sections so the whole floor stays wet.
5. Broadcast flake into the wet base until the surface refuses more, then stop and let it cure.
6. Scrape the excess flake with a floor scraper, vacuum, and wipe the surface.
7. Apply the clear topcoat, back-rolling to work it into the texture, and keep traffic off for 24 hours.

Sections matter. On a 500 square foot floor, two people should work a 10 by 10 foot area at a time so the base never skins before the flake lands.

Broadcast density and timing

Full refusal means throwing flake until the wet epoxy stops accepting it and a thin layer sits on the surface. That typically takes 0.1 to 0.15 pounds per square foot. A 400 square foot garage therefore needs 40 to 60 pounds, or two 25 pound boxes with a little spare for touch-ups.

Timing is temperature dependent. At 70°F, a thin epoxy base starts to gel in 30 to 45 minutes. Broadcasting at minute 50 on a warming floor produces a floor where half the flake is loose after cure. Mix smaller batches, keep the floor shaded, and broadcast immediately behind the roller.

A partial broadcast — the “light flake” look — uses roughly half the material and leaves more of the base color visible. It is a legitimate style, but it shows tire marks and dust more than a full refusal.

Topcoat, cure, and traffic

After scraping, the surface is textured and slightly rough. The topcoat must be applied heavy enough to fill the valleys without pooling. Two thin coats at 3 mils each usually outperform one thick coat, which can trap solvent and blister.

Cure times depend on chemistry and temperature. Polyaspartic topcoats accept foot traffic in 4 to 6 hours and vehicle traffic in 24 hours at 70°F. Standard polyurethane needs 12 to 24 hours for foot traffic and 48 to 72 hours for vehicles. Humidity above 70 percent slows both.

Do not park on the floor early. Hot tires on a topcoat that has not fully cross-linked will imprint the tire tread into the film, and that mark does not come out.

Where flake installs fail

The failures are predictable and almost all trace back to preparation or timing rather than the flake itself.

Peeling at the edges comes from insufficient grinding along the stem walls, where a large grinder cannot reach. Blisters come from moisture vapor pushing through a slab with no mitigation, which is why the $2 to $5 per square foot mitigation line exists. Patchy color comes from broadcasting too thin. Loose flake comes from broadcasting late.

A floor that fails in the first year is usually a preparation failure. A floor that fails in year eight is usually topcoat wear, which is a maintenance item rather than an installation defect.

What the job costs when done once

For a 400 square foot garage, professional epoxy at $8 per square foot is $3,200. Grinding at $2 is $800. Crack repair at $75 for three cracks is $225. The subtotal is $4,225, and a moisture mitigation pass at $3.50 per square foot would add $1,400 if the slab needs it.

That total is the number to compare against a second attempt after a failed DIY job. Removing a cured flake floor costs more than installing it the first time, because the coating has to be ground off before anything new can bond.

Check the flake broadcast cost breakdown for line-item rates, review the installation cost guide for scheduling, and read the flake maintenance guide before the first winter, since the topcoat is what you will be protecting.