APA style is widely used, either entirely or with modifications, by hundreds of other scientific journals (including medical and other public health journals), in many textbooks, and in academia (for papers written in classes). Along with AMA Style and CSE Style, it is one of the major styles for such work.
Powder coating is the technique of applying dry paint to a part. The final cured coating is the same as a 2-pack wet paint. In normal wet painting such as house paints, the solids are in suspension in a liquid carrier, which must evaporate before the solid paint coating is produced.
An epoxy garage floor coating is not paint. Paint for garage floors is a latex acrylic product. Some paints will have a small percentage of epoxy added to the mix to make it more durable than standard paint, but it is still paint. These are known as epoxy paints or 1-part epoxy paint. Epoxy is an actual thermosetting resin that is applied as a coating. It is formed when you mix one part epoxide resin with one part polyamine hardener. The hardener acts as a catalyst and is what gives epoxy its strength. Unlike paint that has to dry, epoxy cures. When the two parts are mixed, a chemical reaction is started which creates an exothermic curing process. This curing process produces polymer structures that are closely cross-linked giving epoxy its superior strength and durability.