EpoxyGrindDIY guide
How to Apply a Flake Broadcast in an Epoxy Floor
Flake broadcasting is a timing-and-technique job — good technique gets you an even, professional-looking floor; bad technique gets you clumps in one corner and bare patches in another.
Flake (colored vinyl or paint chips) gets broadcast into the base coat while it's still wet — not sprinkled on after it dries. The base coat has to be tacky enough to catch and hold the chips, which gives you a real but limited window to work in. This is the step in a full garage floor epoxy job that most visibly separates a professional-looking finish from an amateur one, and it's almost entirely about technique rather than materials.
What you'll need
- Spiked shoes — lets you walk across the wet base coat to broadcast the far side without leaving footprints
- A kit with flake included — or see our best garage floor epoxy kits ranking — most flake systems bundle chips with the base coat
Have your flake staged and ready before you mix the base coat
Once the base coat is mixed, your working window starts — you don't want to be searching for the flake bucket once the clock is running. Open bags, set up a scoop or hopper, and know your broadcast order (back of the garage to the door) before you start rolling.
Roll the base coat in the direction you plan to broadcast
Work from the back wall toward the garage door, so you're always broadcasting onto already-rolled coat and backing yourself out of the space rather than walking back across a section you just finished.
Broadcast at chest height in a sweeping, side-to-side motion
Toss handfuls of flake upward and let them fall, rather than flinging them flat and low — height gives the chips time to spread out and land more randomly instead of clumping in whatever spot your hand happened to release over. Overlap your throws generously; it's much easier to fix a slightly heavy area than to go back and patch a bare one once the coat starts to set.
Use spiked shoes to reach the far side without footprints
On anything bigger than a small area you'll need to walk out onto the wet coat to broadcast the middle and far side. Spiked shoes distribute your weight onto small points that self-level back out, instead of leaving a boot-shaped bare patch in the flake pattern.
Check for full coverage — "less is more" is a myth here
For a full broadcast (the standard residential look), you want enough flake that essentially none of the base coat color is visible through it — a light or "accent" broadcast is a deliberate look, not what happens when you run out of flake partway through. If you can still see bare base coat once the first pass settles, broadcast more; you can always scrape off excess later, but you can't easily add flake to a spot that's already skinned over.
Let the base coat fully cure before the topcoat
Follow your kit's recoat window. Once cured, scrape off any flake that didn't embed into the coat and vacuum thoroughly — loose flake left under the topcoat creates a rough, sandpaper-like final texture instead of the smooth surface a topcoat is supposed to give you.
Mistakes to avoid
- Broadcasting low and flat instead of up and sweeping — this is the single biggest cause of a clumpy, uneven-looking floor.
- Running out of flake mid-broadcast and thinning it out to stretch — buy more than you think you need; unused flake isn't wasted money, it's insurance against a visibly patchy floor.
- Walking on the wet coat without spiked shoes — regular shoes leave flat footprints that read as bare spots once the coat cures.
- Skipping the scrape-and-vacuum step before the topcoat — loose flake under a clear coat telegraphs as a rough, uneven texture you'll feel underfoot for the life of the floor.
- Broadcasting too early, before the base coat is tacky enough to hold the chips — flake that doesn't embed just sits on top and scrapes off, wasting product.
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FAQ
How much flake do I actually need for a full broadcast?
This varies by chip size and manufacturer, but plan on buying more than the "recommended" amount for your square footage listed on the packaging — running short mid-job is a common and avoidable mistake, and unused flake keeps for future touch-ups.
Can two people broadcast a garage floor faster than one?
Yes, and it helps — one person broadcasting a large area alone is racing the base coat's tack window. If you have help, split the floor into zones and broadcast simultaneously rather than sequentially.
What if I get clumps of flake in one spot?
While the coat is still wet, you can gently redistribute clumps by hand or with a soft brush. Once it starts to set, leave it — trying to fix it after the fact usually smears the base coat instead.
Do I need a different broadcast technique for metallic epoxy?
No — metallic epoxy typically doesn't use flake at all; the marbled effect comes from pigment powders and application technique instead. See our metallic epoxy guide for that process.