Most shop quality products (dupont, house of kolor, ect) will have tech manuals for all of their products online. If you used something cheap than I would wait at least 24 hours. I would just hit it lightly with 2000 grit, be careful around any style lines or edges because over sanding is verrrry common to someone who is not experienced. As for buffing, if you are using a commercial buffer I would hit it with rubbing compound than change out the mitt and use swirl mark remover.