Clear coat isn't the best thing to try to use on it. it's a wax. You really can't coat a wax well with anything. When I tried it on my helmet, it beaded up and ran down the helmet.
If you end up getting a clear coat on an RNB surface well, then you didn't put a good coat of RNB on it.
It's basically a car wax. If you wax a car, and get it wet or anything, it'll bead up.
You have 1 of 2 options: use the RNB without a clear coat. If any of it rubs off enough to where you can see the surface beneath, just put another coat of RNB over the area. OR, you can skip using RNB, and use brush n leaf. It's the exact same thing, except in paint form. Or, you can do like I did, cover it with BNL, then use a coat of RNB, just for the heck of it. If it rubs off enough, it'll only show the silver painted surface beneath.