ces69jen, since you said you ar fairly new to restoring a old truck or car I want to intoduce you to a new word,ISOCYANATES! Stay far way from paints that contain this! If inhaled it will turn your lungs rock hard.
I assume its used as a hardner in paints such as POR-15. Which I dont doubt one bit is a good product probably tougher then Zero Rust. But, why take a chance if it will kill you! This is why it cant be sprayed, and the safest way to use it is with a fresh air resporator. Just wanted to pass that along to you. Be safe so you can have fun!