A stained, windowless Seattle garage got a diamond grind and a light Mount Everest flake polyurea floor that brightens the whole room. Installed in one day.
Some garages earn their reputation one tire track at a time. This one, in a north Seattle home, had years of dark wheel marks pressed into gray concrete, a storage nook crammed with bikes and bins, and a side room full of furniture waiting for a better floor. The homeowner wanted the whole space to feel like part of the house again.
In April 2025 our crew installed a garage floor coating in Seattle with Certified Penntek polyurea in Mount Everest flake. The tracks are gone, the room is brighter, and the floor wipes clean.
We came out for the free consultation in February 2025, in the middle of a wet Seattle winter. The garage was full that day, so we worked around boxes, a chair and a rolled-up rug to get readings on bare concrete.
The moisture meter read 4.6% on the slab. We test every slab at the consult because moisture is the number one reason coatings let go. The surface itself was sound but heavily stained, with dark tire paths running from the door toward the back wall, a few patches of worn finish, and an L-shaped layout that wraps around a utility corner with a central vacuum unit and ducting.
By install day the owner had cleared it all out, which made for a clean, open floor to work on.
Sheldon's crew handled the whole garage, nook and side room included, in a single day in late April:
Grinding is the step that matters most here. Those tire marks were not just on the surface. Opening up the concrete gives the basecoat clean pores to bond into instead of old rubber and grime. Our page on the installation process walks through each step.
This garage gets almost no daylight once the door is down. Mount Everest Evolution is a light blend of white, gray and soft tan chips, and it bounces the overhead light back up off the floor. The before and after photos tell the story better than we can. A dim gray box now reads as a clean, bright room.
Light flake also hides more than you might expect. Dust, dried drips and grit from the driveway blend into the pattern, so the floor looks tidy between sweeps.
People search for an epoxy garage floor. What we install is Certified Penntek polyurea, and the difference shows up years down the road.
Typical epoxy is a surface film. It often starts to peel in years 3–5, usually where hot tires sit and moisture pushes up from below. Penntek polyurea forms a chemical bond with the concrete using a silane adhesion promoter, with over 1,300 PSI bond strength. Before the coating comes up, the concrete will come up. The polyaspartic topcoat also resists hot tire pickup, which matters on a floor that used to wear its tire tracks like a map.
Want to see it under abuse? Watch the Penntek Hammer Test. Our post on Penntek vs epoxy for garage floors goes further.
Seattle garages tend to sit at or below grade, and they spend half the year breathing damp air. That is why the moisture reading comes first at every consult, not as an afterthought. If a slab needs it, a two-layer moisture barrier system goes down before the basecoat.
See more on our Seattle garage floor coatings page, or look at a very different Seattle job: a garage turned home office in Fieldstone.
Yes. The crew grinds and coats every bit of exposed floor, so everything needs to be out before they arrive. Plan to keep cars and storage out until the crew gives you the cure times for your floor.
No. Diamond grinding removes the stained top layer of concrete, and the full flake broadcast covers the slab completely. What you see afterward is the flake color, not the old marks.
Not really. Light blends like Mount Everest hide dust and grit well. The topcoat is non-porous, so spills sit on the surface and wipe up instead of soaking in.
Curious how your garage would look in a lighter color? Book a free in-home quote or call 425-226-6085. Nicole and Sheldon own Cascade, and they will bring samples and a moisture meter.
Here's just a few of our previous projects.
