1K Coating vs 2K Coatings

I can appreciate that there is confusion and misuse in terms with it comes to describing automotive coatings. Here are some brief definitions that I hope will dispel the confusion.

NOTE: Typically the term "catalyst" is used separately from terms "activator" and "hardener" (as in epoxy catalyst) because it does not have isocyanates. I don't think there's any hard and fast rule, but it may be worth pointing out.

1K    –    This is a term used to describe a coating that does not require a hardener, catalyst, or activator. For example, this term can be used to describe “single component” paints and all of the aerosol paints we sell with the exception of the Spray Max products. NOTE: I’ve seen “1K” and “Single Stage” used interchangeably. See definition of “Single Stage” below.

2K   –   This describes a coating that needs to be mixed with a hardener, catalyst or activator. This can be used to describe our Eastwood Automotive Finishes, “two component” paints and other urethane finishes.

One/Single Stage – Is used to describe a coating that does not require a clear top coat. A single stage coating may or may not require a catalyst, hardener, or activator. Plus a clear top coat may be added in many cases for enhanced durability, or depth.

Two Stage – Is used to describe a coating system that requires both base and clear coats. This is more commonly referred to as "basecoat/clearcoat" or "BC/CC". The coats of base and clear may or may not require a catalyst, hardener, or activator.