What is the difference between CV and pre-cat? Are there different applications, i.e. use only pre-cat for vertical surfaces and CV for horizontal surfaces?
The differences between pre-cat and CV are quite a few. Pre-cat comes ready mixed for you, CV needs to be catalyzed. Pre-cat has basically no pot life, most CV have a short pot life (8-24 hours). Pre-cat is generally easier to spray, and it has a lower solid content. CV is more difficult to spray, but you need fewer coats to do the same job. Pre-cat is rated TR 2-4 while CV is rated TR6, which is a hardness/chemical resistance test. CV will cure more in the first few hours than pre-cat will; meaning it will be ready to ship/stack faster. CV is much more durable than pre-cat. The pains that you endure with CV are usually worth the gains you get in toughness and abrasion resistance. I generally use pre-cat because it is much more forgiving while spraying than CV is. For wooden countertops, I only use CV. For cabinet exterior/interior, I use pre-cat.