[NachtRitter]

Nah, I wasn't thinking of the Gel Coat. There are two types of resin. One is a "finishing" resin (this is what comes with the auto store repair kits) and one is a "laminating" resin. The finishing resin cures glossy and ought to be sanded before adding another layer. The laminating resin cures a bit duller and doesn't necessarily need to be sanded before adding another layer. The laminating resin shouldn't be used as the final coat, but the finishing resin can be used as an intermediate coat. (Note that I've only read all this; haven't seen it / used it first hand)

So what I was wondering is if you use the two different types of resins, or if you just use the finishing resin and deal with the sanding between applications. Based on your previous response, I'm gonna guess that you're using finishing resin only.