Again,
Stunning work Alex........ and to answer the question (Hope Alex does not mind) Waxing over cured decals is a great way to seal them and buff up the shine. How aggressive you can wax them depends on the decal itself. If its a nice cartograph decal or tamiya decal you can be pretty aggressive with the polishing. I have built lots of nascars with heavy duty decals printed by cartograph and you can get them to shine very well. IF they are a slixx or alps decal I dont reccomend waxing those. The color will come off using wax. Hope this helps...
DaveT