I give you props, I helped my brother do his S10 one time...That stuff stinks & gave me a headache!! I'll let the pros do it.I've done several applications on dump beds now. Its very DYI-able if you want to go the cheap route.
Sand the paint lightly, clean with whatever you have.
Buy a gallon or so, roll it on or a simple paintbrush. The paint levels out on its own and looks good. No fancy process needed.