Here’s a prime example of why an epoxy floor system needs a fully tinted top coat.What you’re looking at is an epoxy novolac top coat. And those dark spots are the intermediate coat poking through the top coat.
Epoxy floors are most beneficial when they have multiple layers of epoxy. Base coats allow for outgassing, intermediate coats add some beef to the system, and the top coat is usually the performance coat.
And as long as each epoxy coat is compatible and installed within the recoat window, you could expect exceptional adhesion between all the coats.
But the one overlooked feature of these floors is the color. And if your color between the intermediate and the top coat aren’t lining up, then you could have a spotty, unprofessional floor.