I've tried the xLac and there definitely is no tacky layer so I don't think it will be possible to use micas or glitters with it unless you part cure, then add glitter/mica then finish the cure. The only thing with doing it that way is you won't have a top coat to seal in the glitter or mica unless you use the iLac top coat over it.
If you want to use micas and glitters, I suggest you use the iLac system - I have used both glitters and micas with mine and they look fab and last really well.
Removal is soooooo easy - no buffing - simply wrap, wait 7 or 8 minutes, remove wrap and most of it has flaked off. Remove remainder with an orange stick. I always wipe the nails with a clean lint free pad soaked in remover just to remove any last traces of base coat.