If you put lacquer over enamel, it may crack the enamel. Unless you're going for the mosaic look (doubtful), you'll want to take it easy. If you're going to try a clear lacquer, yes, do wait for a couple days. Then, put on a very light coat. You want it to almost go on dry. Do several coats this way, and don't get the old paint too wet or it will still crack. This is the way I've done it in the past. The times I've been patient, it's worked. The other times, it didn't.
You might want to check with your local hobby shop to see if they can recommend another way or a new product.

I built a GMP Cricket back in the 80's. I painted the canopy yellow (inside) and left the windscreen clear. It needed a little weight in the front. I was visiting a friend of mine who managed our local Toys R Us and mentioned the weight problem. He went into the returned items pile, pulled out a Luke Duke "action figure" and asked me if it would work. Luke turned out to be the perfect size for the canopy and the exact weight I needed. Not bad for free. Of course, taken out of context, nobody knew he was a Luke Duke doll. They just thought he was some pilot figure I bought somewhere. Having Luke in the cockpit was a finishing touch that made flying just a little more enjoyable.